%0 Journal Article
%A M. I. Kratko
%T The number of switchings that are necessary for the unblocking of a three-step commutator
%J Doklady Akademii Nauk
%D 1976
%P 54-56
%V 227
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1976_227_1_a12/
%G ru
%F DAN_1976_227_1_a12