\Bibitem{GriSte84} \by R.~I.~Grigorchuk, A.~M.~Stepin \paper Gibbs states on countable groups \jour Teor. Veroyatnost. i Primenen. \yr 1984 \vol 29 \issue 2 \pages 351--354 \mathnet{http://mi.mathnet.ru/tvp2062} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=749922} \zmath{https://zbmath.org/?q=an:0557.60089|0544.60096} \transl \jour Theory Probab. Appl. \yr 1985 \vol 29 \issue 2 \pages 359--362 \crossref{https://doi.org/10.1137/1129045} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1985AJQ7100013}