Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP4661_r117646](http://classic.wikipathways.org/instance/WP4661_r117646) 'Amino acid metabolism pathway excerpt: histidine catabolism extension' in Homo sapiens has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference