"Electronically modified polymer-supported cinchona phase-transfer catalysts for asymmetric synthesis of a -alkyl-a -amino acid derivatives.",

Shi, Qinghua; Lee, Yeon-Ju; Song, Hongrui; Cheng, Maosheng; Jew, Sang-sup; Park, Hyeung-geun; Jeong, Byeong-Seon.

Chemistry Letters  (2008),  37(4),  436-437.