Oscillating and asymptotic properties of a class of functional differential equations with maxima Drumi Dimitrov Bajnov; Andreĭ I. Zahariev — 1984 Czechoslovak Mathematical Journal
Oscillation properties of solutions of a class of integro-differential equations Drumi Dimitrov Bajnov; Anatolij Dmitrievich Myshkis; Andreĭ I. Zahariev — 1987 Czechoslovak Mathematical Journal