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- [43] SPECTROSCOPIC CHARACTERISTICS OF THE ERBIUM IONS AND LASER ACTION AT THE TRANSITION S-4(3/2)-]I-4(9/2) (LAMBDA-E ALMOST-EQUAL-TO 1.66 MU-M) IN THE CRYSTALS OF GADOLINIUM, YTTRIUM, AND LUTECIUM ORTHOALUMINATES PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1979, 55 (01): : 79 - 87