Hinkley, E.; Freed, Charles (1969). "Direct Observation of the Lorentzian Line Shape as Limited by Quantum Phase Noise in a Laser above Threshold". Physical Review Letters. 23 (6): 277. Bibcode:1969PhRvL..23..277H. doi:10.1103/PhysRevLett.23.277.
Hinkley, E.; Freed, Charles (1969). "Direct Observation of the Lorentzian Line Shape as Limited by Quantum Phase Noise in a Laser above Threshold". Physical Review Letters. 23 (6): 277. Bibcode:1969PhRvL..23..277H. doi:10.1103/PhysRevLett.23.277.