Yao, Shenglai;Lindenmaier, Nils;Xiong, Yun;Inoue, Shigeyoshi;Szilvási, Tibor;Adelhardt, Mario;Sutter, Jörg;Meyer, Karsten;Driess, MatthiasA Neutral Tetraphosphacyclobutadiene Ligand in Cobalt(I) ComplexesAngewandte Chemie International Edition2014541250-1254