Raubenheimer, Helgard, and Hubert Schmidbaur. 2011. “Gold Coordination During Homogeneous Alkyne and Allene Cyclisation Catalysis: Coordination to Substrates, to Ancillary Ligands and in Intermediates”. South African Journal of Science 107 (3/4): 13 pages. https://sajs.co.za/article/view/10054.