TY  - JOUR
AU  - M. I. Kratko
TI  - The number of switchings that are necessary for the unblocking of a three-step commutator
JO  - Doklady Akademii Nauk
PY  - 1976
SP  - 54
EP  - 56
VL  - 227
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1976_227_1_a12/
LA  - ru
ID  - DAN_1976_227_1_a12
ER  -