APA (7th ed.) Citation

Pontriagin, L. S., & Gamkrelidze, R. V. (1986). Selected research papers. Gordon and Breach Science Publishers.

Chicago Style (17th ed.) Citation

Pontriagin, L. S., and R. V. Gamkrelidze. Selected Research Papers. New York: Gordon and Breach Science Publishers, 1986.

MLA (9th ed.) Citation

Pontriagin, L. S., and R. V. Gamkrelidze. Selected Research Papers. Gordon and Breach Science Publishers, 1986.