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Buzzi Claudio A.; Rodero Ana Livia; Torregrosa Joan: 3-dimensional piecewise linear and quadratic vector fields with invariant spheres. (2024)
Liang Haihua; Torregrosa Joan: Centers of projective vector fields of spatial quasi-homogeneous systems with weight (m,m, n) and degree 2 on the sphere. (2016)
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