Dudek, A., Franěk, F. and Rödl, V. (2009) Cliques in Steiner systems. Mathematica Slovaca, Vol. 59 (Issue 1), pp. 109-120. https://doi.org/10.2478/s12175-008-0112-1
Dudek, Andrzej, Franěk, František and Rödl, Vojtěch. "Cliques in Steiner systems" Mathematica Slovaca 59, no. 1 (2009): 109-120. https://doi.org/10.2478/s12175-008-0112-1