@article{UZKU_1931_91_4_a5,
     author = {K. P. Persidskii},
     title = {{\CYRO} {\cyrp}{\cyrr}{\cyre}{\cyrd}{\cyre}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyrt}{\cyre}{\cyro}{\cyrr}{\cyre}{\cyrm}{\cyra}{\cyrh}},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {43--48},
     publisher = {mathdoc},
     volume = {91},
     number = {4},
     year = {1931},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_1931_91_4_a5/}
}