The study of the complexation of calyx(4)arene and calyx(4)resorcinarene with resin acids by the RP HPLC Method. Binding constants determination - O. I. Kalchenko; S. O. Cherenok; A. V. Solovyov; V. V. Gorbatchuk; Yu. Suikov; V. I. Kalchenko (Journal of organic and pharmaceutical chemistry, 2016)