“…Blocking sets and the blockers of set families (families are often regarded as the hyperedge families of hypergraphs) are discussed, e.g., in the monographs [11,22,29,31,32,43,46,48,50,51,53,54,56,67,70,72,73,78,79,81] and in the works [3,4,5,6,7,9,10,12,13,16,17,20,21,23,24,25,26,27,28,30,33,34,38,39,40,41,42,44,45,47,52,…”