Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP3594_r117682](http://classic.wikipathways.org/instance/WP3594_r117682) 'Circadian rhythm genes' in Homo sapiens has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference