D. Fortes, R. S. Herrera, S. Gonz?lez, M. Garc?a, A. Romero, and A. M. Cruz, “Performance of photosynthetic pigments, according to regrowth age after grazing Pennisetum purpureum cv. Cuba CT-115 in the rainy season”, Cuban J. Agric. Sci., vol. 44, no. 4, Dec. 2010.