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Karl K. Rebane, Purely electronic zero-phonon line as the foundation stone for high-resolution matrix spectroscopy, single-impurity-molecule spectroscopy, and persistent spectral hole burning. Recent developments: Spectroscopy in Cryocrystals and Matrices, Low Temp. Phys. 29, (2003) [Fiz. Nizk. Temp. 29, 1101-1108, (2003)] DOI: https://doi.org/10.1063/1.1619354.