\Bibitem{Kul80} \by Vik.~S.~Kulikov \paper On modifications of degenerations of surfaces with~$\varkappa=0$ \jour Math. USSR-Izv. \yr 1981 \vol 17 \issue 2 \pages 339--342 \mathnet{http://mi.mathnet.ru/eng/im1953} \crossref{https://doi.org/10.1070/IM1981v017n02ABEH001361} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=595259} \zmath{https://zbmath.org/?q=an:0471.14014|0463.14011} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1981MW12400005}