Kushilevitz, Eyal; Linial, Nathan; Rabinovich, Yuri; Saks, Michael (1996), "Witness sets for families of binary vectors", Journal of Combinatorial Theory, Series A, 73 (2): 376–380, doi:10.1016/S0097-3165(96)80015-X, MR1370141.
Kushilevitz, Eyal; Linial, Nathan; Rabinovich, Yuri; Saks, Michael (1996), "Witness sets for families of binary vectors", Journal of Combinatorial Theory, Series A, 73 (2): 376–380, doi:10.1016/S0097-3165(96)80015-X, MR1370141.