HETEROLIGAND COPPER(II) COMPLEXES WITH CITRIC ACID AND HISTIDINE: AC POLAROGRAPHY STUDIES СтатьяDorofeeva G.I., Kante S.A., Molodkin A.K., Selezneva N.G., Zaitsev P.M.Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya. Том 24. 1998. С. 419-422