Yazman, J. A.; McDowell, R. E.; Cestero, H.; Arroyo-Aguilú, J. A.; Rivera-Anaya, J. D.; Soldevila, M.; Román-García, F. Efficiency of Utilization of Tropical Grass Pastures by Lactating Cows With and Without Supplement. JAUPR 1982, 66, 200-222.