Silva, Maria Conceição, et al. “Characters of Pennisetum Spp. Used for the Initial Selection in the Genetic Improvement Program for Elephant Grass”. Semina: Ciências Agrárias, vol. 37, no. 4, Aug. 2016, pp. 2035-42, doi:10.5433/1679-0359.2016v37n4p2035.