Montanucci R. R., Taxonomic history and status of the Coahuila Bishop’s Cap, Haseltonia, 2008, 14:176-184, doi: 10.2985/1070-0048-14.1.176
The paper presents the history and status of the name Astrophytum coahuilense. It compares resemblance to A. myriostigma with arguments for separating the taxa.