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• [2] L. Hörmander, Linear partial differential operators, Academic Press, New York, 1963.
• [3] J. Kurzweil, On the inversion of Lyapunov's second theorem on stability of motion, Czechoslovak Math. J. 81 (1956), 217-259, 455-484; English transl., Amer. Math. Soc. Transl. (2) 24 (1963), 19-77.
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• [5] José L. Massera, On the existence of Lyapunov functions, Fac. Ingen. Montevideo Publ. Inst. Mat. Estadíst 3 (1959/1960), 111–124. MR 0144027 (26 #1575)
• [6] José L. Massera, Contributions to stability theory, Ann. of Math. (2) 64 (1956), 182–206. MR 0079179 (18,42d)
• [7] V. V. Nemytskii and V. V. Stepanov, Qualitative theory of differential equations, Princeton Mathematical Series, No. 22, Princeton University Press, Princeton, N.J., 1960. MR 0121520 (22 #12258)
• [8] Hans Rademacher, Über partielle und totale differenzierbarkeit von Funktionen mehrerer Variabeln und über die Transformation der Doppelintegrale, Math. Ann. 79 (1919), no. 4, 340–359 (German). MR 1511935, http://dx.doi.org/10.1007/BF01498415
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Bibliography

[1]

M. W. Hirsch, On combinatorial submanifolds of differentiable manifolds, Comment Math. Helv. 36 (1962), 103-111. MR 0133833 (24:A3658)

[2]

L. Hörmander, Linear partial differential operators, Academic Press, New York, 1963.

[3]

J. Kurzweil, On the inversion of Lyapunov's second theorem on stability of motion, Czechoslovak Math. J. 81 (1956), 217-259, 455-484; English transl., Amer. Math. Soc. Transl. (2) 24 (1963), 19-77.

[4]

S. Lefschetz, Differential equations: Geometric theory, Interscience, New York, 1957. MR 0153903 (27:3864)

[5]

J. Massera, On the existence of Lyapunov functions, Fac. Ingen. Agrimens. Montevideo Publ. Didact. Inst. Mat. Estadíst. 3 (1960), 111-124. MR 0144027 (26:1575)

[6]

-, Contributions to stability theory, Ann. of Math. 64 (1956), 182-206. MR 0079179 (18:42d)

[7]

V. V. Nemytskii and V. V. Stepanov, Qualitative theory of differential equations, Princeton Univ. Press, Princeton, N. J., 1960. MR 0121520 (22:12258)

[8]

H. Rademacher, Über partielle und totale Differenzierbarkeit von Functionen mehrerer Variabeln, und über die Transformation der Doppelintegrale, Math. Ann. 79 (1918), 340-359. MR 1511935

[9]

S. Smale, On gradient dynamical systems, Ann. of Math. 74 (1961), 199-206. MR 0133139 (24:A2973)

[10]

F. W. Wilson, Implicit submanifolds, J. Math. Mech. 17 (1968), 229-236. MR 0229252 (37:4826)