Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP84_r117316](http://classic.wikipathways.org/instance/WP84_r117316) 'NAD biosynthesis' in Saccharomyces cerevisiae has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference