@article{FPM_2014_19_1_a1,
     author = {O. V. Gerasimova},
     title = {Rolling simplexes and their {commensurability.~II} (a~lemma on the directrix and focus)},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {13--19},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2014_19_1_a1/}
}