@article{MO_2018_1_a1,
     author = {E. G. Smoljanova and N. V. Malyshkina},
     title = {Hyperbola and biquadratic equations},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {5--9},
     year = {2018},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2018_1_a1/}
}