Rakhimov S.B., Khalilova L.M., Zhumaeva E.Sh., Gafurova D.A., and Smanova Z.A. “Determination Of Tungsten By Solid Phase Spectroscopy Using Immobilized Reagents”. The American Journal of Applied Sciences 2, no. 09 (September 30, 2020): 244–254. Accessed August 2, 2025. https://theamericanjournals.com/index.php/tajas/article/view/2372.