Barthlott W., Porembski S., Ecology and morphology of Blossfeldia liliputana (cactaceae): A poikilohydric and almost astomate succulent, Botanica Acta, 1996, 109(2):161-166, doi: 10.1111/j.1438-8677.1996.tb00556.x
The study combines stem anatomy, measurements of stomatal density and several months of drying in Blossfeldia liliputana. It also describes water uptake through areoles, seed traits and experiments on seed transport by ants.