Vázquez-Sánchez M., Terrazas T., Arias S., Comparative morphology and anatomy of Backebergia militaris (Echinocereeae–Cactaceae) cephalium, Plant Systematics and Evolution, 2016, 302(3):245-256, doi: 10.1007/s00606-015-1256-4
Morphology and anatomy of the Mitrocereus militaris cephalium, comparison with vegetative branches and changes associated with flowering and ageing.