The Study of Extended π Conjugation Systems in Photochromic Naphthopyran Compounds
MENG Qing-hua, FANG Yong-zeng, WANG Zhen, HUANG De-yin
Imaging Science and Photochemistry . 2012, (2): 150 -158 .  DOI: 10.7517/j.issn.1674-0475.2012.02.150