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Acharya, PK and Narayanan, PS (1973) Vibration-Spectra Of Ferroelectric Sulfates .1. (Nh4)2so4, Linh4so4, Nanh4so4.2h2o And (Nh4)2cd2(So4)3. In: Indian Journal of Pure and Applied Physics, 11 (7). pp. 514-518.
Acharya, PK and Narayanan, PS (1973) Vibration-Spectra Of Ferroelectric Sulfates .2. Rbhso4, Nh4hso4 And (Nh4)3h(So4)2. In: Indian Journal of Pure & Applied Physics, 11 (7). pp. 519-521.