Recyclable NHC-Ni Complex Immobilized on Magnetite/Silica Nanoparticles for C-S Cross-Coupling of Aryl Halides with Thiols - Yoon, Hyo-Jin; Choi, Jung-Woo; Kang, Homan; Kang, Taegyu; Lee, Sang-Myung; Jun, Bong-Hyun; Lee, Yoon-Sik (Synlett, 2010)