Zeng, Xiaoqing; Bernhardt, Eduard; Beckers, Helmut; Banert, Klaus; Hagedorn, Manfred; Liu, Hailiang Angewandte Chemie - International Edition, 2013 , vol. 52, # 12 p. 3503 - 3506 Angew. Chem., 2013 , vol. 125, # 12 p. 3587 - 3591,5