G. Ramappa, P., & S. Ramachandra, K. (2010). Extraction-Spectrophotometric Determination of Niobium in Steels and Columbite using Metoclopramide and Thiocyanate*. Asian Journal of Chemistry, 1(1), 19–24. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/25363