@article{VTAMU_2017_22_3_a4,
     author = {S. E. Zhukovskiy and Chan Thi Ngok and L.-E. I. Ngomirakiza},
     title = {On quadratic mappings properties and conditions for inverse functions existence},
     journal = {Vestnik rossijskih universitetov. Matematika},
     pages = {533--538},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTAMU_2017_22_3_a4/}
}