@article{IVM_1969_2_a6,
     author = {A. P. Norden and Yu. B. Simonov},
     title = {A~certain interpretation of unitary space of constant curvature},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {63--71},
     publisher = {mathdoc},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_2_a6/}
}