1. I. NAHRINGBAUER, J.-O. LUNDGREN and E.K. ANDERSEN, 1979. Acta Cryst., B35, 508–510.
2. Structure Reports, 35B, 3. 2. Ibid, 38B, 3.
3. J.M. ADAMS, 1979. Acta Cryst., B35, 1084–1088.
4. Structure Reports, 20, 432. 2. Ibid, 42B, 500.
5. O. SIMONSEN and N. THORUP, 1979. Acta Cryst., B35, 432–435.