Asali, Khalil Jamil. Sites of Reactivity During Ligand-Exchange Reactions in Octahedral Group VIB Metal Carbonyls, dissertation, December 1979; (https://digital.library.unt.edu/ark:/67531/metadc330718/m1/1/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .