Reference:
  Author: Saulius Gražulis and Andrius Merkys and Antanas Vaitkus and Mykolas Okulič-Kazarinas
  Title: Computing stoichiometric molecular composition from crystal structures
  Journal: Journal of Applied Crystallography
  Year: 2015
  Volume: 48
  Pages: 85-91
  DOI: 10.1107/S1600576714025904
  URL: http://scripts.iucr.org/cgi-bin/paper?S1600576714025904
