Periodic solutions of systems of autonomous functional-differential equations of neutral type with small delays. Differencial"nye Uravnenija, 10 (1974), 1923-1931 (in Russian; English translation Differ. Equations, 10 (1974), 1479-1485 (1976)).
| Authors: Akhmerov R., Kamenskii M., Kozyakin V., Sobolev A. |