Citation: Laguna, M.; Sanjuan, M.; Orera, V.; Rubin, J.; Palacios, E.; Pique, M.; Bartolome, J.; Berar, J. (1993). X-ray and raman study of the low temperature NH4MnF3 structure;evidence of librational motion of the NH4^+^ ion _cod_database_code 1008535. Journal of Physics: Condensed Matter, 5, pp. 283-300.