Yergozhin, Y., B. Taussarova, R. Ashkeyeva, and L. Tugelbayeva. “Investigation of Complexing Ability of Ionites With Various Groups to Some Heavy and Transition Metal Ions”. Chemical Bulletin of Kazakh National University, Vol. 69, no. 1, May 2013, pp. 84-89, doi:https://doi.org/10.15328/chemb_2013_184-89.