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♦ 1How Important are Columnar Cacti as Sources of Water and Nutrients for Desert Consumers? A Review, B. O. Wolf and C. Martínez del Rio, Isotopes Environ. Health Stud., 2003, Vol. 39(1), pp. 53-67
♦ 2Effectiveness of Dispersal of an Ornithocorous Cactus Myrtillocactus geometrizans (Cactaceae) in a Patchy Environment, Mónica G. Pérez-Villafaña and Alfonso Valiente-Banuet, The Open Biology Journal, 2009, 2, 101-113