Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP1397_r117924](http://classic.wikipathways.org/instance/WP1397_r117924) 'GPCRs, odorant' in Mus musculus has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference