Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP472_r117324](http://classic.wikipathways.org/instance/WP472_r117324) 'Phosphatidic acid and phospholipid biosynthesis' in Saccharomyces cerevisiae has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference