authors, Reinhard Haubold ... [et al.] ; editors, Dieter Koschel ... [et al.] ; chief editor, Peter Merlet ; suppl. v. B1 : gw - suppl. v. B2 : us. -- 8th ed. -- Springer-Verlag, 1993. -- (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. 4 . N, Nitrogen).