Trakarnpruk, W. ., A. Wannatem, and J. Kongpeth. “Sandwich-Type Cobalt Tungstophosphate: Synthesis, Characterization and Catalytic Activity”. Journal of Metals, Materials and Minerals, vol. 25, no. 1, May 2015, https://www.jmmm.material.chula.ac.th/index.php/jmmm/article/view/121.