Differential equations of the second order with retarded argument; some problems of the theory of vibrations of systems with retardation/
by S. B. Norkin.
- Providence, R.I.: American Mathematical Society, 1972.
- vi, 285 p.: 24 cm.
- Translations of mathematical monographs, v. 31. .
Translation of DifferentČsial#nye uravneniiČa vtorogo poriČadka s zapazdyvaiČushchim argumentom.