<i>Ab initio</i> simulations of α- and β-ammonium carbamate (NH<sub>4</sub>·NH<sub>2</sub>CO<sub>2</sub>), and the thermal expansivity of deuterated α-ammonium carbamate from 4.2 to 180 K by neutron powder diffraction
Acta crystallographica. Section B, Structural science, crystal engineering and materials./Acta crystallographica. Section B, Structural science, crystal engineering and materials