Ytterbium(III) Perfluorooctanoate Catalyzed One-Pot, Three-Component Synthesis of Fully Substituted Pyrazoles under Solvent-Free Conditions - Shen, Li; Cao, Song; Liu, Nianjin; Wu, Jingjing; Zhu, Longjie; Qian, Xuhong (Synlett, 2008)