Sara Brunetti Alberto Del Lungo Francesco Del Ristoro A cycle lemma for permutation inversions. 1-13 2002 257 Discret. Math. 1 https://doi.org/10.1016/S0012-365X(02)00254-6 https://www.wikidata.org/entity/Q124808048 db/journals/dm/dm257.html#BrunettiLR02