A.  Vrijdaghs, Reynders, M., A Muasya, M., Larridon, I., Goetghebeur, P., and Smets, E. F., ?Morphology and development of spikelets and flowers in Cyperus and Pycreus (Cyperaceae)?, Plant Ecology and Evolution, vol. 144, pp. 44?63, 2011.