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Roy, Anil K and Mehta, CL (1995) Boson Inverse Operators and a New Family of Two-photon Annihilation Operators. In: Journal of Modern Optics, 42 (3). 707-719 .
Mehta, CL and Roy, Anil K and Saxena, GM (1994) Squeezed vacuum as an eigenstate of two-photon annihilation operator. In: Pramana - Journal of Physics, 42 (4). 311-314 .