APA (7th ed.) Citation

Catarino, P., Higgins, P., & Levi, I. (2015). On inverse subsemigroups of the semigroup of orientation-preserving or orientation-reversing transformations. Algebra and Discrete Mathematics.

Chicago Style (17th ed.) Citation

Catarino, P., P.M Higgins, and I. Levi. "On Inverse Subsemigroups of the Semigroup of Orientation-preserving or Orientation-reversing Transformations." Algebra and Discrete Mathematics 2015.

MLA (8th ed.) Citation

Catarino, P., et al. "On Inverse Subsemigroups of the Semigroup of Orientation-preserving or Orientation-reversing Transformations." Algebra and Discrete Mathematics, 2015.

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