Colina, M., P. H. Gardiner, Z. Rivas, y F. Troncone. «Modified Procedure for the Simultaneous Determination of Nitrogen, Phosphorus and Sulphur by Hydrogen Peroxide Microwave Digestion and Ion Chromatography». Ciencia, Vol. 14, n.º 1, 1, https://mail.produccioncientificaluz.org/index.php/ciencia/article/view/9316.