Hanna, John V., Pike, Kevin J., Charpentier, Thibault, Kemp, Thomas F., Smith, Mark E., Lucier, Bryan E. G., Schurko, Robert W. and Cahill, Lindsay S. (2010) A Nb-93 solid-state NMR and density functional theory study of four- and six-coordinate niobate systems. Chemistry: A European Journal, Vol.16 (No.10). pp. 3222-3239. doi:10.1002/chem.200901581 ISSN 0947-6539.