10.1184/R1/6480179.v1 Martin Goldstern Martin Goldstern Menachem Kojman Menachem Kojman Universal bridge free graphs Carnegie Mellon University 1994 Bridges (Graph theory) 1994-01-01 00:00:00 Journal contribution https://kilthub.cmu.edu/articles/journal_contribution/Universal_bridge_free_graphs/6480179 Abstract: "We prove that there is no countable universal B[subscript n]-free graph for all n and that there is no countable universal graph in the class of graphs omitting all cycles of length at most 2k for k [> or =] 2."