References
V. V. Ovsyankin and P. P. Feofilov, Pis'ma ZhETF,3, no. 12, 494, 1966.
V. V. Ovsyankin and P. P. Feofilov, Pis'ma ZhETF,4, no. 11, 471, 1966.
V. L. Bakumenko, A. N. Vlasov, E. S. Kovarskaya, G. S. Kozina, and V. N. Favorin, Pis'ma ZhETF,2, no. 1, 27, 1965.
Additional information
In conclusion I wish to thank P. P. Feofilov and V. V. Ovsyankin for discussing the results.
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Bakumenko, V.L. Mechanism for two-stage excitation of Er3+ fluorescence in CaWO4 . J Appl Spectrosc 7, 429–430 (1967). https://doi.org/10.1007/BF00607256
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DOI: https://doi.org/10.1007/BF00607256