Publications with shared reference: Unusual Structural Types in Manganese Cluster Chemistry from the Use of <i>N</i>,<i>N</i>,<i>N</i>‘,<i>N</i>‘-Tetrakis(2-hydroxyethyl)ethylenediamine: Mn<sub>8</sub>, Mn<sub>12</sub>, and Mn<sub>20</sub> Clusters