APA (7th ed.) Citation

Piekart, B., & Walendziak, A. (2011). On filters and upper sets in CI-algebras. Algebra and Discrete Mathematics.

Chicago Style (17th ed.) Citation

Piekart, B., and A. Walendziak. "On Filters and Upper Sets in CI-algebras." Algebra and Discrete Mathematics 2011.

MLA (8th ed.) Citation

Piekart, B., and A. Walendziak. "On Filters and Upper Sets in CI-algebras." Algebra and Discrete Mathematics, 2011.

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