Valiente-Banuet A., Santos Gally R., Arizmendi M. C., Casas A., Pollination biology of the hemiepiphytic cactus Hylocereus undatus in the Tehuacán Valley, Mexico, Journal of Arid Environments, 2007, 68(1):1-8, doi: 10.1016/j.jaridenv.2006.04.001
Controlled pollination and nocturnal and diurnal flower visitors in a cultivated Tehuacán Valley population.