Structures and Vibrational Spectra of Adenine and Protonated Adenine
LIANG Xiao-Jing, CUI Li, WU De-Yin, TIAN Zhong-Qun
Acta Physico-Chimica Sinica . 2009, (08): 1605 -1610 .  DOI: 10.3866/PKU.WHXB20090808