Spectrophorometric Studies of Alkali Metal Ion Complexes of P – Tetrabutgl – Calix [4] arenas, Farrokh Gharib , Dr.Karim Zare and Afsaneh Amiri. Russian Journal of Inorganic Chemisty , Vol , 49 , No , 10 , 2004 , 1511 – 1514.

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