Ráb, Miloš: Periodic solutions of $\ddot x=f(x,\dot x)$.
(English).
In:
Ráb, Miloš
and Vosmanský, Jaromír (eds.): Proceedings of Equadiff III.
3rd Czechoslovak Conference on Differential Equations and Their Applications. Brno, Czechoslovakia, August 28 - September 1, 1972.
Univ. J. E. Purkyně - Přírodovědecká fakulta, Brno, 1973.
pp. 127-138
Ráb, Miloš; Vosmanský, Jaromír: Preface.
(English).
In:
Ráb, Miloš
and Vosmanský, Jaromír (eds.): Proceedings of Equadiff III.
3rd Czechoslovak Conference on Differential Equations and Their Applications. Brno, Czechoslovakia, August 28 - September 1, 1972.
Univ. J. E. Purkyně - Přírodovědecká fakulta, Brno, 1973.
pp. 9