Crystal-field effects in Er 3 + - and Yb 3 + -doped hexagonal NaYF 4 nanoparticles by García Flores, A. F., Matias, J.S., Garcia, D. J., Martínez, E. D., Cornaglia de la Cruz, Pablo Sebastian, Lesseux, G.G., Ribeiro, R. A., Urbano, R. R., Rettori, C.

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