TY  - JOUR
AU  - V. I. Mironenko
AU  - V. V. Mironenko
TI  - The center-focus problem and reflecting function
JO  - Problemy fiziki, matematiki i tehniki
PY  - 2020
SP  - 80
EP  - 84
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PFMT_2020_2_a14/
LA  - en
ID  - PFMT_2020_2_a14
ER  -