Kučera, P., Savický, P., Vorel, V. A Lower Bound on CNF Encodings of the At-most-one Constraint. Theoretical Computer Science. 2019, 762(March), 51-73. ISSN 0304-3975. E-ISSN 1879-2294. Dostupné z: https://doi.org/10.1016/j.tcs.2018.09.003.