Maurice Brookhart, Malcolm L. H. Green, Carbon-hydrogen-transition metal bonds. Journal of Organometallic Chemistry, 250(1), 395-408 (1983). doi10.1016/0022-328X(83)85065-7.
Maurice Brookhart, Malcolm L. H. Green, and Gerard Parkin "Agostic interactions in transition metal compounds" Proceeding of the U.S. National Academy of Sciences 2007, volume 104, 6908–6914.doi10.1073/pnas.0610747104
Sam J. La Placa and James A. Ibers "A Five-Coordinated d6 Complex: Structure of Dichlorotris(triphenylphosphine)ruthenium (II)" Inorganic Chemistry, 1965, volume 4, pp 778 - 783. doi10.1021/ic50028a002