Referenze Bibliografiche
                  
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Bull. Inst. Polit. Iasi, 
XI(XV) (
1965), 35-42; | 
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                     I. 
                     BARBALAT
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                     HALANAY
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Revue de Math. pures et appl., 
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1958), 395-411; | 
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                     R. M. 
                     BIANCHINI
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Due criteri di unicità e convergensa del metodo di Picard per equasioni differenziali ordinarie, to appear in the 
Boll. U.M.I.; | 
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MR 229881 | 
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                     F. 
                     BRAUER
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                     C. 
                     CILIBERTO
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Rend. Accad. Sci. Fis. Mat. Soc. Naz. Sci. Lett. Arti, Napoli (IV) 
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1981), 187-198; | 
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                     E. A. 
                     CODDINGTON
                   - 
                     N. 
                     LEVINSON
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Theory of ordinary differential equations, 
McGraw Hill Book Co., 
1955; | 
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                     R. 
                     CONTI
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Atti Acc. Naz. Lincei, Rend. Cl. Sci. Fis. Mat. Nat., (8) 
26 (
1959), 636-640; | 
MR 110847 | 
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                     R. 
                     CONTI
                   [9] On non linear boundary value type problems, RIAS TR 
                  64-12, Baltimore, June 1964;
                  
                     W. A. 
                     COPPEL
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Stability and asymptotic behavior of differential equations, 
Heath Math. Monographs, Boston, 
1965; | 
MR 190463 | 
Zbl 0154.09301 
                  
                     J. 
                     CRONIN
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Fixed points and topological degree in nonlinear analysis; 
A.M.S. Math. Surveys 
                  11, Providence, 
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                     H. 
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                     H. 
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                   [3] III Konferenz über nichtlineare Schwingungen, 
Akad. Verlag, Berlin, 
1965, Teil I, 157-167; | 
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                     L. N. 
                     ESHUKOV
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                     L. N. 
                     ESHUKOV
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Uspehi Mat. Nauk, XIII 
3(81) (
1958), 191-196; | 
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                     A. F. 
                     FILIPPOV
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Uspehi Mat. Nauk, XIV 
6(90) (
1959), 197-201; | 
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                     A. F. 
                     FILIPPOV
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Vestnik Moskovskogo Universiteta, N° 2, (
1963), 33-36; | 
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                     J . B . 
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                     J. B. 
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Proc. A.M. S., 
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                     A. 
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Un teorema di esistenza per un problema di tipo interface, to appear in 
Le Matematiche, Catania; | 
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                     S. N. 
                     HILT
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An existence theorem for non linear differential Systems, to appear in 
Ann. di Mat. pura ed appl.
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                     A . JA. 
                     HOKRYAKOV
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                     A. 
                     LASOTA
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                     C. 
                     OLECH
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Ann. Pol. Math., 
18 (
1966), 131-139; | 
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                     A. 
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                     Z. 
                     OPIAL
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Ann. Pol. Math., 
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1964), 69-94; | 
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                     A. 
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Bull. Acad. Pol. Sci., Sér. Sci. Math. Astr. Phys., 
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                     A. 
                     LASOTA
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                     Z. 
                     OPIAL
                   [3] III Konferenz über nichtlineare Schwingungen, 
Akad. Verlag, Berlin, 
1965, Teil I, 186-189; | 
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                     A. 
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Bull. Acad. Pol. Sci., Sér. Sci. Math. Astr. Phys., 
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                     J. L. 
                     MASSERA
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                     J. J. 
                     SCHÄFFER
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Ann. of Math, 
67 (
1958), 517-573; | 
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                     J. L. 
                     MASSERA
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                     J. J. 
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Ann. of Math., 
69 (
1959), 88-104; | 
Zbl 0178.17702 
                  
                     J. L. 
                     MASSERA
                   - 
                     J. J. 
                     SCHÄFFER
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Linear differential equations and function spaces, 
Academic Press, 
1966; | 
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                     Z. 
                     OPIAL
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Linear problems for Systems of nonlinear differential equations, to appear ; | 
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                     D. 
                     PHAM
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                     D. 
                     WEISS
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C. R. Acad. Sci. Paris, Sér. A, 
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                     T. J. 
                     PIGNANI
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                     W. M. 
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J. of the Elisha Mitchell Sci. Soc., 
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                     P. 
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Atti Acc. Naz. Lincei, Rend. Cl. Sci. Fis. Mat. Nat., (8) 
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                     E. 
                     SCRUCCA
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Un problema ai limiti quasi lineare in spasi di Banach, to appear in 
Atti Acc. Naz. Lincei, Rend. Cl. Sci. Fis. Mat. Nat.; | 
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Zbl 0166.12801 
                  
                     V. P. 
                     SKRIPNIK
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Matem. Sbornik, 
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                     M. I. 
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                     M. M. 
                     VAINBERG
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Variational methods for the study of non linear operators, 
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                     D. 
                     WEISS
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                     D. 
                     PHAM
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Bull. Math. Soc. Math. R.S.R., 
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                     W. M. 
                     WHYBURN
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1944), 45-61; | 
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                     W. M. 
                     WHYBURN
                   [5] Proc. of a Conference of Diff. Equations, Univ. of Maryland, 
1955, 1-21; | 
MR 82002 | 
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