Osuna Osvaldo and Rebollo-Perdomo Salomón and Villaseñor Gabriel: On a class of invariant algebraic curves for Kukles systems. (2016)
Osuna Osvaldo and Villaseñor-Aguilar Gabriel: On the Dulac functions for multiply connected domains. (2013)
Osuna Osvaldo and Villaseñor Gabriel: Some properties of the Dulac functions set. (2011)