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- [6] THE 2ND ORDER EQUILIBRIUM POINTS (IN RELATION TO 2ND ORDER PHASE TRANSITION ZHURNAL FIZICHESKOI KHIMII, 1958, 32 (09): : 2213 - 2215
- [7] PHASE CHANGES OF THE 2ND ORDER PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION B, 1957, 70 (06): : 553 - 558
- [9] PHASE MODULATION IN 2ND-ORDER NONLINEAR-OPTICAL PROCESSES PHYSICAL REVIEW A, 1990, 42 (07): : 4085 - 4101