Magel, G. A., Fejer, M. M. & Byer, R. L. Quasi-phase-matched second-harmonic generation of blue light in periodically polarised LiNbO3: Applé Phys Lett 56. 108. 110 (in 1990).
Magel, G. A., Fejer, M. M. & Byer, R. L. Quasi-phase-matched second-harmonic generation of blue light in periodically poled LiNbO3. Appl. Phys. Lett. 56, 108–110 (1990).