Rebane KK. 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. Fiz. Nizk. Temp. [інтернет]. 01, Вересень 2003 [цит. за 10, Листопад 2025];29(9-10):1101-8. доступний у: http://80.92.230.95/index.php/fnt/article/view/f29-1101e