@article{VMUMM_2011_2_a4,
     author = {P. A. Borodin},
     title = {The mirror property of metric $2$-projection},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {32--36},
     publisher = {mathdoc},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2011_2_a4/}
}