APA (7th ed.) Citation

Prokopovich, P., & Laurinchikas, А. OƂ odnojj trigonometricheskojj sisteme.

Chicago Style (17th ed.) Citation

Prokopovich, P., and А Laurinchikas. OƂ Odnojj Trigonometricheskojj Sisteme.

MLA (9th ed.) Citation

Prokopovich, P., and А Laurinchikas. OƂ Odnojj Trigonometricheskojj Sisteme.

Warning: These citations may not always be 100% accurate.