Sulfonic acid supported on hydroxyapatite-encapsulated-γ-Fe2O3 nanocrystallites as a magnetically separable catalyst for one-pot reductive amination of carbonyl compounds. - Deng, Jia; Mo, Li-Ping; Zhao, Fei-Yang; Hou, Lan-Lan; Yang, Li; Zhang, Zhan-Hui (Green Chemistry, 2011)