Introduction to the theory and application of differential equations with deviating arguments /
El'sgol'ts, Lev Ernestovich.
Norkin, Sim Borisovich.
Casti, John L.,1943-
New York London Academic Press
1973
Translation of: 'Vvedenie v teoriiu differentsial'nykh uravneniĭ s otkloniaiushchimsia argumentom'. 2nd ed. Moscow : Nauka Press, 1971
Bibliography: p.293-357
Differential equations.