TY  - JOUR
AU  - J. Węgrzyn
TI  - Differential equations with infinite number of limit cycles
JO  - Applicationes Mathematicae
PY  - 1971
SP  - 391
EP  - 395
VL  - 12
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/am-12-4-391-395/
DO  - 10.4064/am-12-4-391-395
LA  - en
ID  - 10_4064_am_12_4_391_395
ER  -