1. Conditions for the oscillation of the solutions of first order differential equations with retarded argument;Tramov, M. I.;Izv. Vys\v{s}. U\v{c}ebn. Zaved. Matematika,1975
2. Sharp conditions for oscillations caused by delays;Ladas, Gerasimos;Applicable Anal.,1979
3. Oscillating and monotone solutions of first-order differential equations with deviating argument;Koplatadze, R. G.;Differentsial\cprime nye Uravneniya,1982
4. Oscillations caused by several retarded and advanced arguments;Ladas, G.;J. Differential Equations,1982
5. Oscillation criteria in delay equations;Arino, O.;J. Differential Equations,1984