@article{FPM_2010_16_1_a6,
     author = {A. G. Kushner},
     title = {$r$-tuple almost product structures},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {81--93},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2010_16_1_a6/}
}