%0 Journal Article %T spectrophotometric study of complex eormation of Y, La, andCe with some 18-and15-membered crown ethers in methanol %A K. Taheri %A Ronaghi, Gholam Hossein %A CHamsaz, Mahmod %A M. Ansarifard %J Asian Journal of Chemistry %@ 0970-7077 %D 2009