\Bibitem{Gus71} \by S.~M.~Gusein-Zade \paper On the action of a~circle on manifolds \jour Mat. Zametki \yr 1971 \vol 10 \issue 5 \pages 511--518 \mathnet{http://mi.mathnet.ru/mzm7078} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=358839} \zmath{https://zbmath.org/?q=an:0227.57014} \transl \jour Math. Notes \yr 1971 \vol 10 \issue 5 \pages 731--734 \crossref{https://doi.org/10.1007/BF01109033}