Fernández Ñ., Javier. “The Micro-Diffusion Method of Conway. Its Application in the Assay of Ammonia, Urea and Non-Protein Nitrogen”. Anales De La Facultad De Medicina, vol. 39, no. 4, Dec. 1956, pp. 1318-22, https://doi.org/10.15381/anales.v39i4.10747.