@article{VMUMM_1996_2_a4,
     author = {P. V. Al'brecht},
     title = {On differentiable $\varepsilon$-selections},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {23--26},
     publisher = {mathdoc},
     number = {2},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1996_2_a4/}
}