Summers, H., Dowd, P., Summers, H., White, I., Tan, M., Houng, Y., & Wang, S. (1995). Measurement of differential gain and linewidth enhancement factor of InGaAs vertical cavity surface emitting laser. Electronics Letters, 31(7), pp. 557-559. doi:10.1049/el:19950371

Summers, Huw, P. Dowd, H.D Summers, I.H White, M.R.T Tan, Y.M Houng, and S.Y Wang. "Measurement of Differential Gain and Linewidth Enhancement Factor of InGaAs Vertical Cavity Surface Emitting Laser." Electronics Letters 31, no. 7 (1995): 557-559.

Summers, Huw, et al. "Measurement of Differential Gain and Linewidth Enhancement Factor of InGaAs Vertical Cavity Surface Emitting Laser." Electronics Letters 31.7 (1995): 557-559.