Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP2185_r125281](http://classic.wikipathways.org/instance/WP2185_r125281) 'Purine metabolism' in Mus musculus has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference