Rivera, D., M. Obando, H. Barbosa, D. Rojas Tapias, and R. Bonilla Buitrago. “Evaluation of Polymers for the Liquid Rhizobial Formulation and Their Influence in the Rhizobium-Cowpea Interaction”. Universitas Scientiarum, vol. 19, no. 3, July 2014, pp. 265-7, doi:10.11144/Javeriana.SC19-3.eplr.