APA (7th ed.) Citation

Donets, G. A., & Gurin, A. L. (2018). Problem on mathematical safe of the locks with two states.

Chicago Style (17th ed.) Citation

Donets, G. A., and A. L. Gurin. Problem on Mathematical Safe of the Locks with Two States. 2018.

MLA (8th ed.) Citation

Donets, G. A., and A. L. Gurin. Problem on Mathematical Safe of the Locks with Two States. 2018.

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