TY  - JOUR
AU  - V. N. Ushakov
AU  - A. A. Ershov
AU  - M. V. Pershakov
TI  - On one addition to evaluation by L.\,S.~Pontryagin of the geometric difference of sets in a plane
JO  - Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta
PY  - 2019
SP  - 63
EP  - 73
VL  - 54
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IIMI_2019_54_a5/
LA  - ru
ID  - IIMI_2019_54_a5
ER  -