SPECTRA OF LANTHANIDE AND TUNGSTEN OXYCHLORIDES DOPED WITH NEODYMIUM AND EUROPIUM Статья Venskovskii N.I., Zolin V.F., Markushev V.M., Ngassapa F.N.B., Tararov A.V., Tupoleva A.L. Journal of Applied Spectroscopy. Kluwer Academic Publishers-Plenum Publishers. Том 59. 1994. С. 537-542
