Thermal shift of fluorescent light R1 in ruby below 80K

Sharp resonant trapping of fluorescent light R1 in ruby

Theory of the Pulsation of Fluorescent Light From Ruby

High resolution measurements of the ruby R1 line at low temperatures

Revisiting the temperature dependence of the homogeneous R1 linewidth in ruby

Polarization of Phonon-Assisted Fluorescence in Ruby

Sharp line excitation of resonance fluorescence in pink ruby