@article{VMUMM_1993_6_a22,
     author = {Vl. V. Prelov},
     title = {Two lemmas on a {Jacobian}},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {91--94},
     publisher = {mathdoc},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_6_a22/}
}