@article{DAN_1971_196_3_a11,
     author = {P. E. Sobolevskii},
     title = {Semigroups of growth~$\alpha$},
     journal = {Doklady Akademii Nauk},
     pages = {535--537},
     publisher = {mathdoc},
     volume = {196},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_3_a11/}
}