\Bibitem{Mar77} \by P.~E.~Markov \paper The rigidity of internally pasted star-shaped surfaces \jour Mat. Zametki \yr 1977 \vol 22 \issue 3 \pages 321--333 \mathnet{http://mi.mathnet.ru/mzm8052} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=487928} \zmath{https://zbmath.org/?q=an:0362.53001} \transl \jour Math. Notes \yr 1977 \vol 22 \issue 3 \pages 669--675 \crossref{https://doi.org/10.1007/BF02412492}