\Bibitem{KonOle83} \by V.~A.~Kondrat'ev, O.~A.~Oleinik \paper Boundary-value problems for partial differential equations in non-smooth domains \jour Russian Math. Surveys \yr 1983 \vol 38 \issue 2 \pages 1--86 \mathnet{http://mi.mathnet.ru//eng/rm7159} \crossref{https://doi.org/10.1070/RM1983v038n02ABEH003470} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=695471} \zmath{https://zbmath.org/?q=an:0523.35010} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1983SL90300001}