By Pejov L.   Petrusevski V.M.   in Journal of Physics and Chemistry of Solids

ISSN:0022-3697|64|8|1353-1363

Elsevier‎(2003)‎

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By Pejov L.   Stefov V.   Soptrajanov B.   in Vibrational Spectroscopy

ISSN:0924-2031|19|2|435-439

Elsevier‎(1999)‎

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