Drupal-Biblio17<style face="normal" font="default" size="100%">Isolation and Structural Characterization of a Mackay 55-Metal-Atom Two-Shell Icosahedron of Pseudo-I-h Symmetry, Pd55L12(mu(3)-CO)20 (L = PR3, R = Isopropyl): Comparative Analysis with Interior Two-Shell Icosahedral Geometries in Capped Three-Shell Pd-14</style>