authors, Irene Baptista de Alleluia ... [et al.] ; editors in chief, Hans Karl Kugler, Cornelius K ; gw, us. -- Springer, 1982. -- (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. 69 . Tc, Technetium ; Suppl. v.1).