[文献書誌] Okazaki, Takao, Laali, Kenneth K.: "A theoretical(DFT, GIAO-NMR, NICS)study of the carbocations and oxidation dications from azulenes, homoazulene, benzazulenes, benzohomoazulenes, and the isomeric azulenoazulenes"Org.Biomol.Chem.. 1・17. 3078-3093 (2003)