Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP463_r117332](http://classic.wikipathways.org/instance/WP463_r117332) 'Purine fermentation' in Saccharomyces cerevisiae has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference