J. Džurina, J. Buša, E. A. Hayryan, “Oscillatory Properties of Second-Order Functional Differential Equations of the Neutral Type”, Differ. Uravn., 38:4 (2002), 565–569; Differ. Equ., 38:4 (2002), 599–604
2.
J. Dzurina, J. Buša, E. A. Hayryan, “Oscillation Criteria for Second-Order Differential Equations of Neutral Type with Mixed Arguments”, Differ. Uravn., 38:1 (2002), 126–128; Differ. Equ., 38:1 (2002), 137–140
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