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- [8] MANDELSTAM-BRILLOUIN AND ULTRASONIC STUDIES OF PHASE-TRANSITIONS IN A (NH4)2BEF4 CRYSTAL KRISTALLOGRAFIYA, 1976, 21 (03): : 534 - 539
- [10] CRITICAL DISCUSSION ON FERROELECTRIC PHASE-TRANSITION IN (NH4)2BEF4 PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1975, 71 (01): : K61 - K65