@article{VMUMM_1993_4_a19,
     author = {R. A. Gorak},
     title = {Some numerical relations for three-dimensional {Cremona} transformations},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {81--85},
     year = {1993},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_4_a19/}
}