Author: Sficas, Yiannis G.

Grammatikopoulos, Myron K.; Ladas, G.; Sficas, Yiannis G.: Necessary and sufficient conditions for oscillation of delay equations with constant coefficients. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 2, pp. 262-270
Philos, Christos G.; Sficas, Yiannis G.: Oscillatory and asymptotic behavior of second and third order retarded differential equations. (English). Czechoslovak Mathematical Journal, vol. 32 (1982), issue 2, pp. 169-182

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