\Bibitem{Rue77} \by D.~Ruelle \paper On manifolds of~phase coexistence \jour TMF \yr 1977 \vol 30 \issue 1 \pages 40--47 \mathnet{http://mi.mathnet.ru/tmf2714} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=443782} \transl \jour Theoret. and Math. Phys. \yr 1977 \vol 30 \issue 1 \pages 24--29 \crossref{https://doi.org/10.1007/BF01029356}