Centers of projective vector fields of spatial quasi-homogeneous systems with weight $(m,m,n)$ and degree $2$ on the sphere

by Haihua Liang, Joan Torregrosa
Published 2016-11-01

Piecewise linear differential systems with an algebraic line of separation

by Armengol Gasull, Joan Torregrosa, Xiang Zhang
Published 2020-02-01