Geusic, J. E.; Marcos, H. M.; Van Uitert, L. G. (1964). "Laser oscillations in nd-doped ytrium aluminum, ytrium gallium and gadolinium garnets". Applied Physics Letters. Quyển4 số10. tr.182. Bibcode:1964ApPhL...4..182G. doi:10.1063/1.1753928.
Geusic, J. E.; Marcos, H. M.; Van Uitert, L. G. (1964). "Laser oscillations in nd-doped ytrium aluminum, ytrium gallium and gadolinium garnets". Applied Physics Letters. Quyển4 số10. tr.182. Bibcode:1964ApPhL...4..182G. doi:10.1063/1.1753928.