Deletion of Graph-tool

Comment: to Graph Modelling Language or other appropriate article, per . The nearest I found to a reliable independent ref is http://journal.ub.tu-berlin.de/eceasst/article/download/459/447 Proceedings of the Fourth International Workshop on Foundations and Techniques for Open Source Software Certification
Stance: merge
Cited policy: Wikipedia:Notability (WP:NSOFT)