Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP321_r117315](http://classic.wikipathways.org/instance/WP321_r117315) 'Nucleotide metabolism' in Saccharomyces cerevisiae has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference