B. Ghasemi, Jahan, Babaee, Elaheh, Khavarian, Fakhredin. Conductometric study of the complex formation of Rb+, Cs+, NH4 +, K+, Tl+ and Ag+ ions with several crown ethers in acetonitrile-dimethylsulfoxide and acetonitrile-dimethylformamide binary mixtures. Journal of the Iranian Chemical Research. 2010;3(3):167-177. doi: