Hiroyuki Nakashima Jun-Ya Hasegawa Hiroshi Nakatsuji On the O2 binding of Fe-porphyrin, Fe-porphycene, and Fe-corrphycene complexes. 1363-1372 2006 27 Journal of Computational Chemistry 12 http://dx.doi.org/10.1002/jcc.20447 db/journals/jcc/jcc27.html#NakashimaHN06a