%0 Journal Article %A Gent, Ian %A Kitaev, Sergey %A Konovalov, Alexander %A Linton, Steve %A Nightingale, Peter %T $S$-crucial and bicrucial permutations with respect to squares %J Journal of integer sequences %D 2015 %V 18 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/JIS_2015__18_6_a1/ %G en %F JIS_2015__18_6_a1