title: From storable sources of atomic Nb- and Ta- ions to isolable anionic tris(1,3-butadiene)metal complexes: [M(eta(4)-C4H6)3]-, M = Nb, Ta.
authors: Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
authors: Victor J
authors: VJ
authors: Sussman
authors: John E
authors: JE
authors: Ellis