Guevara, J. C. ., Trione, S. O. ., Estevez, O. R. ., & Cony, M. A. . (2006). A Sampling Procedure to Determine the Nitrogen Content in Opuntia ficus-indica Cladodes. Journal of the Professional Association for Cactus Development, 8, 63–72. https://doi.org/10.56890/jpacd.v8i.279