Cardinal, J., Fiorini, S., Joret, G., Jungers, R., & Munro, J. I. (2013). Sorting under Partial Information (without the Ellipsoid Algorithm). Combinatorica - an international journal of the János Bolyai Mathematical Society, 33(6), 655-697. https://doi.org/10.1007/s00493-013-2821-5 (Original work published 2013)