Roidl, G., Enkelmann, V., Adams, R. D., & Bunz, U. H. F. (1999). An alternative synthesis of Vollhardt's [1,2-diethynyl-3,4-bis(trimethylsilyl)cyclobutadiene]cyclopentadienylcob alt and selective formation of its dimer. Journal of Organometallic Chemistry, 578(1-2), 144-149.