@article{SEMR_2017_14_a96,
     author = {R. Boukoucha},
     title = {Explicit expression for a first integral for some classes of two-dimensional differential systems},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {903--913},
     year = {2017},
     volume = {14},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2017_14_a96/}
}