G. A. Martínez-Rodríguez, M. A. Vázquez, J. L. Guzmán, R. Ramos-Santana, and O. Santana, “Use of polyacrylamide as an erosion control strategy in a highly eroded soil of Puerto Rico”, JAUPR, vol. 91, no. 3-4, pp. 87–100, Oct. 2007.