@article{DAN_1958_122_2_a19,
     author = {G. B. Ravich and B. N. Egorov},
     title = {A study of the polymorphism of $\mathrm{N}$-ethyl-3,4-dinitropyrrole},
     journal = {Doklady Akademii Nauk},
     pages = {250--253},
     publisher = {mathdoc},
     volume = {122},
     number = {2},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_122_2_a19/}
}