[1] ok H.X. Li, X.F. Chen, M.H.Wang, Y.P. Xu, Appl. Catal. A: Gen. 225 (2002)117. [2] ok X.F. Chen, H.X. Li, H.S. Luo, M.H. Qiao, Appl. Catal. A: Gen. 233 (2002)13. [3] not ok yet D.G. Tong, W. Chu, Y.Y. Luo, X.Y. Ji, Y. He, J. Mol. Catal. A: Chem. 265 (2006) 195. http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TGM-4M57J49-7-1C&_cdi=5258&_user=616134&_orig=browse&_coverDate=03%2F16%2F2007&_sk=997349998&view=c&wchp=dGLbVtz-zSkzk&md5=82bca495eafe23d0a48ea0164d17ddce&ie=/sdarticle.pdf [4] ok Christoskovaa, St. G.; Stoyanovaa, M.; Georgievaa, M.; Mehandjiev,D. Mater. Chem. Phys. 1999, 60, 39.
333 not ok yet. http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TGM-4M57J49-7-1C&_cdi=5258&_user=616134&_orig=browse&_coverDate=03%2F16%2F2007&_sk=997349998&view=c&wchp=dGLbVtz-zSkzk&md5=82bca495eafe23d0a48ea0164d17ddce&ie=/sdarticle.pdf