APA (7th ed.) Citation

Barros, A., & Labbe, M. (1993). The multi-level uncapacitated facility location problem is not submodular. European Journal of Operational Research, 71(1), 130. https://doi.org/10.1016/0377-2217(93)90266-P

Chicago Style (17th ed.) Citation

Barros, A.I, and M. Labbe. "The Multi-level Uncapacitated Facility Location Problem Is Not Submodular." European Journal of Operational Research 71, no. 1 (1993): 130. https://doi.org/10.1016/0377-2217(93)90266-P.

MLA (9th ed.) Citation

Barros, A.I, and M. Labbe. "The Multi-level Uncapacitated Facility Location Problem Is Not Submodular." European Journal of Operational Research, vol. 71, no. 1, 1993, p. 130, https://doi.org/10.1016/0377-2217(93)90266-P.