1. Mercury-free amalgam?;Puttkammer;Zahnaerztl Rundsch,1928
2. Mercury-free amalgam?;Schwarz;Zahnaerztl Rundsch,1929
3. Investigation of a low-melting metal alloy (gallium compound) as a substitute for amalgam fillings;Poutot;Corespondezblatt Zahnaertze,1930
4. Experimental investigation of a fusible metal intended as an amalgam substitute;Greth;Stoma,1930
5. On the question of replacement of mercury in dental amalgams with gallium;Weibke;Z Elektrochem,1940