G. RAMAPPA, P.; S. RAMACHANDRA, K. Extraction-Spectrophotometric Determination of Niobium in Steels and Columbite using Metoclopramide and Thiocyanate*. Asian Journal of Chemistry, [S. l.], v. 1, n. 1, p. 19–24, 2010. Disponível em: https://asianpubs.org/index.php/ajchem/article/view/25363. Acesso em: 3 oct. 2024.