APA (7th ed.) Citation

Petrenko, O., & Protasov, I. (2015). Ultrafilters on G-spaces. Algebra and Discrete Mathematics.

Chicago Style (17th ed.) Citation

Petrenko, O.V, and I.V Protasov. "Ultrafilters on G-spaces." Algebra and Discrete Mathematics 2015.

MLA (8th ed.) Citation

Petrenko, O.V, and I.V Protasov. "Ultrafilters on G-spaces." Algebra and Discrete Mathematics, 2015.

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