Jörg H. Siekmann Graham Wrightson Erratum: a counterexample to W. Bibel's and E. Eder's strong completeness result for connection graph resolution. 145-147 2001 48 J. ACM 1 http://doi.acm.org/10.1145/363647.363697 db/journals/jacm/jacm48.html#SiekmannW01