authors, Rudolf Warncke ... [et al.] ; editor, Helga Hartwig ; system support, Gottfried Olbrich ; gw : Formula index for 3rd suppl. vol. 1 to 4, us : Formula index for 3rd suppl. vol. 1 to 4. -- Springer-Verlag, 1988. -- (Gmelin handbook of inorganic chemistry / prepared and issued by Gmelin-Institut für Anorganische Chemie der Max-Planck-Gesellschaft zur Förderung der Wissenschaften ; director, Ekkehard Fluck ; system no. 13).