@article{VMUMM_1990_2_a0,
     author = {U. Il'khamov and D. D. Sokoloff},
     title = {Realizability of lentil-shaped polyhedra in a {pseudo-Euclidean} space},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--6},
     year = {1990},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1990_2_a0/}
}