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- [1] VACUUM FLUCTUATIONS OF A QUANTIZED SCALAR FIELD IN A ROBERTSON-WALKER UNIVERSE PHYSICAL REVIEW D, 1975, 11 (12): : 3378 - 3383
- [3] GROWTH OF SCALAR-FIELD QUANTUM FLUCTUATIONS IN ROBERTSON-WALKER UNIVERSES PHYSICAL REVIEW D, 1988, 37 (08): : 2099 - 2103
- [8] ON THE DEFINITION OF A POSITIVE FREQUENCY PART FOR A QUANTIZED SCALAR FIELD IN SEVERAL ROBERTSON-WALKER UNIVERSES PROGRESS OF THEORETICAL PHYSICS, 1980, 64 (04): : 1280 - 1293