\Bibitem{Gry78} \by A.~I.~Gryuntal' \paper Existence of non-self-intersecting closed geodesic of general elliptic type on surfaces, close to a~sphere \jour Mat. Zametki \yr 1978 \vol 24 \issue 2 \pages 267--278 \mathnet{http://mi.mathnet.ru/mzm8210} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=509911} \zmath{https://zbmath.org/?q=an:0393.58008} \transl \jour Math. Notes \yr 1978 \vol 24 \issue 2 \pages 644--650 \crossref{https://doi.org/10.1007/BF01105320}