Burity, H. A.; Faris, M. A.; Coulman, B. E. Nitrogenase Activity and Vegetative Regrowth of Alfalfa Grown Alone and in Mixture With Grass After Successive Harvests. PAB 2014, 24 (6), 683-692. https://doi.org/10.1590/S1678-3921.pab1989.v24.15866.