Ciuffo, Liliana Eugenia del Carmen, and María Belli. 2006. “Radioactive Trace in Semi Natural Grassland. Effect of 40K in Soil and Potential Remediation”. Electronic Journal of Biotechnology 9 (3). Valparaíso, Chile:0-0. https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/v9n3-5.