Wakamatsu, Takamichi; Nagao, Kazunori; Ohmiya, Hirohisa; Sawamura, Masaya Angewandte Chemie - International Edition, 2013 , vol. 52, # 44 p. 11620 - 11623 Angew. Chem., 2013 , vol. 125, # 44 p. 11834 - 11837,4