Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP423_r117348](http://classic.wikipathways.org/instance/WP423_r117348) 'Threonine and methionine biosynthesis' in Saccharomyces cerevisiae has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference