Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP346_r117330](http://classic.wikipathways.org/instance/WP346_r117330) 'Protein modifications' in Saccharomyces cerevisiae has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference