{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,20]],"date-time":"2026-03-20T23:56:20Z","timestamp":1774050980961,"version":"3.50.1"},"reference-count":0,"publisher":"The Electronic Journal of Combinatorics","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Electron. J. Combin."],"abstract":"<jats:p>A graph is $Y\\Delta Y$ reducible if it can be reduced to isolated vertices by a sequence of series-parallel reductions and $Y\\Delta Y$ transformations. It is still an open problem to characterize $Y\\Delta Y$ reducible graphs in terms of a finite set of forbidden minors.  We obtain a characterization of such forbidden minors that can be written as clique $k$-sums for $k=1, 2, 3$. As a result we show constructively that the total number of forbidden minors is more than 68 billion up to isomorphism.<\/jats:p>","DOI":"10.37236\/1033","type":"journal-article","created":{"date-parts":[[2020,1,11]],"date-time":"2020-01-11T05:04:10Z","timestamp":1578719050000},"source":"Crossref","is-referenced-by-count":7,"title":["More Forbidden Minors for Wye-Delta-Wye Reducibility"],"prefix":"10.37236","volume":"13","author":[{"given":"Yaming","family":"Yu","sequence":"first","affiliation":[]}],"member":"23455","published-online":{"date-parts":[[2006,1,25]]},"container-title":["The Electronic Journal of Combinatorics"],"original-title":[],"link":[{"URL":"https:\/\/www.combinatorics.org\/ojs\/index.php\/eljc\/article\/download\/v13i1r7\/pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.combinatorics.org\/ojs\/index.php\/eljc\/article\/download\/v13i1r7\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2020,1,18]],"date-time":"2020-01-18T04:26:42Z","timestamp":1579321602000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.combinatorics.org\/ojs\/index.php\/eljc\/article\/view\/v13i1r7"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2006,1,25]]},"references-count":0,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2006,1,7]]}},"URL":"https:\/\/doi.org\/10.37236\/1033","relation":{},"ISSN":["1077-8926"],"issn-type":[{"value":"1077-8926","type":"electronic"}],"subject":[],"published":{"date-parts":[[2006,1,25]]},"article-number":"R7"}}