https://cadipt.mie.utoronto.ca/publications/broadening-effects-and-ergodicity-in-deep-level-photo-thermal-spectroscopy-of-defect-states-in-semi-insulating-gaas-a-combined-temperature-pulse-rate-and-time-domain-study-of-defect-state-kinetics/

Andreas Mandelis and Jun Xia, "Broadening effects and ergodicity in deep level photo-thermal spectroscopy of defect states in semi-insulating GaAs: a combined temperature-, pulse-rate- and time-domain study of defect state kinetics", Proc. 15 Int. Conf. Photoacoustic Photothermal Phenomena (15 ICPPP), July 19 – 23, 2009, Leuven, Belgium, J. Phys. Conf. Ser. 214 012001 (1 – 7) (2010).