Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP1581_r115241](http://classic.wikipathways.org/instance/WP1581_r115241) 'Histidine metabolism' in Mycobacterium tuberculosis has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference