Jha, A; Naftaly, M; Jordery, S; Samson, B N; Taylor, E R; Hewak, D; Payne, D N; Poulain, M; Zhang, G (1995). Pure and Applied Optics: Journal of the European Optical Society Part A. 4 (4): 417. Bibcode:1995PApOp...4..417J. doi:10.1088/0963-9659/4/4/019. {{cite journal}}: Пропущений або порожній |title= (довідка)
Borchert, Y.; Sonstrom, P.; Wilhelm, M.; Borchert, H.; Baumer, M. (2008). Nanostructured Praseodymium Oxide: Preparation, Structure, and Catalytic Properties. Journal of Physical Chemistry C. 112 (8): 3054. doi:10.1021/jp0768524.
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Jha, A; Naftaly, M; Jordery, S; Samson, B N; Taylor, E R; Hewak, D; Payne, D N; Poulain, M; Zhang, G (1995). Pure and Applied Optics: Journal of the European Optical Society Part A. 4 (4): 417. Bibcode:1995PApOp...4..417J. doi:10.1088/0963-9659/4/4/019. {{cite journal}}: Пропущений або порожній |title= (довідка)
