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APA Citation
Radžiūtė, L., Gaigalas, G., Kato, D., Jönsson, P., Rynkun, P., Kučas, S., Jonauskas, V., & Matulianec, R. (n.d.). energy level structure of Er3+. Journal of quantitative spectroscopy & radiative transfer, 152, 94–106. http://access.bl.uk/ark:/81055/vdc_100042322061.0x00005a