Transfer rate of K⁺ ions from aqueous picrate solutions into 1,2 dichloroethane solutions of the macrocyclic polyether dibenzo-18-crown-6, Danesi, P.R., Chiarizia R., Pizzichini Massimo, and Saltelli A. , Journal of Inorganic and Nuclear Chemistry, 1978///, Volume 40, p.1119 - 1123, (1978)