TY - JOUR AU - Yu. I. Sapronov TI - The principle of the invariance of the rotation JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1970 VL - 25 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1970_25_5_a18/ LA - ru ID - RM_1970_25_5_a18 ER -