TY  - JOUR
AU  - A. I. Schetnikov
TI  - A Sum of Angles of a Self-intersecting Polygon
JO  - Matematičeskoe obrazovanie
PY  - 2004
SP  - 78
EP  - 86
IS  - 1
UR  - http://geodesic.mathdoc.fr/item/MO_2004_1_a2/
LA  - ru
ID  - MO_2004_1_a2
ER  -