1. Watanabe, Y., and Nishizawa, J.: (273217)and 762975, 1960. This reference was cited in NISHIZAWA,J., SASAKI, I., and TAKAHASHI, K.: ‘Effects of roughening cleaved surfaces on the characteristics of GaAs injection laser diodes’,Appl. Phys.Lett., 1965,6, pp. 115–116. Early works of other researchers are reviewed in DUPUIS, R.D.: ‘An introduction to the development of the semiconductor laser’,IEEE J. Quant. Electron., 1987,QE-23, pp. 651–657
2. Nishizawa, J., and Watanabe, Y.: (205068)and No. 221218, 1953