APA (7th ed.) Citation

Targonskij, A. L., & Targonskaja, I. I. (2015). Extremal problem for open sets in case the point at infinity.

Chicago Style (17th ed.) Citation

Targonskij, A. L., and I. I. Targonskaja. Extremal Problem for Open Sets in Case the Point at Infinity. 2015.

MLA (8th ed.) Citation

Targonskij, A. L., and I. I. Targonskaja. Extremal Problem for Open Sets in Case the Point at Infinity. 2015.

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