@article{IZKAB_2021_1_a2,
     author = {A. S. Ibrahim},
     title = {Comparative analysis
},
     journal = {News of the Kabardin-Balkar scientific center of RAS},
     pages = {20--27},
     publisher = {mathdoc},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IZKAB_2021_1_a2/}
}