Citation: Sillen, L.G.; Edstrand, M. (1942). On the Crystal Structure of Arppe's Bismuth Oxychloride Bi24 O31 Cl10 and the Isomorphous Oxybromide ('Step-Lattice Oxyhalides'). Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie (-144,1977), 104, pp. 178-196.