Selected figures and DFT computational output from
Fortes, A. D., I. G. Wood, D. Alfé, E. R. Hernàndez, M. J. Gutmann, & H. A. Sparkes (2014): Structure, hydrogen bonding and thermal expansion of ammonium carbonate monohydrate Acta Crystallographica B70(6), 948-962 (doi:10.1107/S205252061402126X)