Thomas Böhme Ken-ichi Kawarabayashi John Maharry Bojan Mohar Linear connectivity forces large complete bipartite minors. 557-582 2009 99 J. Comb. Theory, Ser. B 3 http://dx.doi.org/10.1016/j.jctb.2008.07.006 db/journals/jct/jctb99.html#BohmeKMM09a