APA (7th ed.) Citation

Geffert, V., & Popély, N. Refinement of the alternating space hierarchy.

Chicago Style (17th ed.) Citation

Geffert, Viliam, and Norbert Popély. Refinement of the Alternating Space Hierarchy.

MLA (9th ed.) Citation

Geffert, Viliam, and Norbert Popély. Refinement of the Alternating Space Hierarchy.

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