CJCU
Molecular Design of Crown Ethers(ⅩⅩ)-- Syntheses and Cation Selectivities of Benzo-15-crown-5 Derivatives Containing Thiocycle and Selenacycle
ZHANG Heng-Yi, YANG Ying-Wei, LIU Yu 
Chem. J. Chinese Universities . 2000, (12): 1858 -1860 .