E. Yanushevskaya, V. Suprunchuk, O. Buket, and O. Ivanyuk, “Features of formation and identification of sparingly soluble and coordination compounds of polyhexametyleneguanidine with Pb(ІІ), Cd(ІІ), Cu(ІІ), Zn(ІІ) in aqueous solutions”, EEJET, vol. 3, no. 6(81), pp. 4–8, Jun. 2016.