@article{JSFU_2019_12_2_a1,
     author = {Ahmed Bendjeddou and Aziza Berbache and Abdelkrim Kina},
     title = {Limit cycles for a class of polynomial differential systems via averaging theory},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {145--159},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2019_12_2_a1/}
}