Bruins, E. M. Differential equations and the problem of impulsive force and accelerating force. (English) Zbl 0403.70004 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 11(1975), No. 3, 111-118 (1977). MSC: 70F99 70F05 70F10 PDFBibTeX XMLCite \textit{E. M. Bruins}, God. Vissh. Uchebn. Zaved., Prilozh. Mat. 11, No. 3, 111--118 (1977; Zbl 0403.70004)
Pisarenko, V. G. Equations with deviating argument, arising in a problem of many gravitating electrically charged bodies taking into account the retardation of the interaction forces. (Russian) Zbl 0403.34063 Differential equations with deviating argument, Proc. 4th All-Union Conf., Kiev 1975, 255-269 (1977). MSC: 34K99 34K05 70F10 83C10 PDFBibTeX XML
Sergysels, Roland Orbites périodiques asymétriques de deuxième sorte du problème restreint. (French) Zbl 0358.70007 VII. int. Konf. nichtlineare Schwingungen, Berlin 1975, Bd. I, 2; Abh. Akad. Wiss. DDR, Jahrg. 1977, 4N, 253-260 (1977). Reviewer: Roland Sersysels MSC: 70F10 70F15 PDFBibTeX XML