Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP280_r89704](http://classic.wikipathways.org/instance/WP280_r89704) 'Carbon monoxide dehydrogenase pathway' in Saccharomyces cerevisiae has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference