APA (7th ed.) Citation

Köbler, J., Schöning, U., & Torán, J. (1991). Graph isomorphism is low for PP. Univ. Ulm, Fak. für Informatik.

Chicago Style (17th ed.) Citation

Köbler, Johannes, Uwe Schöning, and Jacobo Torán. Graph Isomorphism Is Low for PP. Ulm: Univ. Ulm, Fak. für Informatik, 1991.

MLA (9th ed.) Citation

Köbler, Johannes, et al. Graph Isomorphism Is Low for PP. Univ. Ulm, Fak. für Informatik, 1991.