\Bibitem{Bab80} \by I.~K.~Babenko \paper Analytical properties of Poincar\'e series of a loop space \jour Mat. Zametki \yr 1980 \vol 27 \issue 5 \pages 751--765 \mathnet{http://mi.mathnet.ru/mzm6493} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=578259} \zmath{https://zbmath.org/?q=an:0455.55006|0447.55007} \transl \jour Math. Notes \yr 1980 \vol 27 \issue 5 \pages 359--367 \crossref{https://doi.org/10.1007/BF01139848} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1980KZ74800008}