@article{RM_1973_28_4_a13,
     author = {V. M. Dubrovskii},
     title = {Equations of degree four},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1973},
     volume = {28},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_4_a13/}
}