APA (7th ed.) Citation

Khrapak, A., & Schmidt, W. (2011). Negative ions in liquid helium. Физика низких температур.

Chicago Style (17th ed.) Citation

Khrapak, A.G, and W.F Schmidt. "Negative Ions in Liquid Helium." Физика низких температур 2011.

MLA (8th ed.) Citation

Khrapak, A.G, and W.F Schmidt. "Negative Ions in Liquid Helium." Физика низких температур, 2011.

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