@article{IM2_1971_5_5_a8,
     author = {S. M. Gusein-Zade},
     title = {$U$-actions of a~circle and fixed points},
     journal = {Izvestiya. Mathematics},
     pages = {1127--1143},
     year = {1971},
     volume = {5},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1971_5_5_a8/}
}