1. Linear Differential Equations with Retarded Argument.;Myshkis,1972
2. Oscillations caused by retarded actions;Ladas;Applicable Analysis,1974
3. On the solution of a linear homogeneous second order differential equation of the unstable type with retarded action;Kamenskii;Trudy Sem. Teor. Differential Uravenenii Otklon Argumenton, Univ. Druzby Narodov Patrisa Lumumby,1963
4. Oscillation and asymptotic behavior of solutions with retarded argument;Ladas;J. diff. Eqns,1971
5. Differential equations of the second order with retarded argument;Norkin;A.M.S. Translations of Mathematical Monographs,1972