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@article{IVM_1969_10_a8, author = {L. Z. Kruglyakov}, title = {Pseudofocal families of $d$-planes in $P_n$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {70--77}, publisher = {mathdoc}, number = {10}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1969_10_a8/} }
L. Z. Kruglyakov. Pseudofocal families of $d$-planes in $P_n$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (1969), pp. 70-77. http://geodesic.mathdoc.fr/item/IVM_1969_10_a8/