Forbidden subgraph pairs for traceability of block-chains

by Binlong Li, Hajo Broersma, Shenggui Zhang
Published 2013-04-01

A remark on star-C4 and wheel-C4 Ramsey numbers

by Yanbo Zhang, Hajo Broersma, Yaojun Chen
Published 2014-10-01

On a directed tree problem motivated by a newly introduced graph product

by Antoon H. Boode, Hajo Broersma, Jan F. Broenink
Published 2015-10-01