The Structure of HoMn_2O_5 Formed by Two-Layer Perovskite Blocs [Mn_{0.5}O_{2.5}] Separated by HoMn Rock-Salt Layers Kalaydjiev, K. ; Midlarz, T. ; Gospodinov, M. ; Kirov, M. ; Baychev, M. ; Popov, Chr. ; Lovchinov, K. Abstract Publication: Journal of Physical Studies Pub Date: 2004 Bibcode: 2004JPhSt...8..373K