WASET
Payungsak, S. , Wongchaisuwat, A. , Meesuk, L.. " [Ca(2,2'-bipyridine)3]2+ -Montmorillonite: A Potentiometric Sensor for Sulfide ion". World Academy of Science, Engineering and Technology, Open Science Index 67, International Journal of Chemical and Molecular Engineering, (2012), 6(7), 608 - 611.