Reza Ghiasvand, Ali, Behrooz Rezaei, and Gholam Abbas Masroor. 2010. “Synthesis of a New Hydroxytriazene Derivative and Its Application for Selective Extraction- Spectrophotometric Determination of Nickel(II)”. Asian Journal of Chemistry 18 (3):2185-93. https://asianpubs.org/index.php/ajchem/article/view/20973.