\Bibitem{Dem13} \by V.~P.~Demichev \paper An optimal estimate for the covariance of indicator functions of associated random variables \jour Teor. Veroyatnost. i Primenen. \yr 2013 \vol 58 \issue 4 \pages 804--812 \mathnet{http://mi.mathnet.ru/tvp4543} \crossref{https://doi.org/10.4213/tvp4543} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=3403023} \elib{https://elibrary.ru/item.asp?id=21277132} \transl \jour Theory Probab. Appl. \yr 2014 \vol 58 \issue 4 \pages 675--683 \crossref{https://doi.org/10.1137/S0040585X97986849} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=000346703700009} \elib{https://elibrary.ru/item.asp?id=24020898}