Weeks, Mary Elvira(1932)."The discovery of the elements: X.The alkaline eart metals and magnesium and cadmium".Journal of Chemical Education 9 (6): 1046–1057.Bibcode""Bibcode 1932JChEd...9.1046W""doi:10.1021/ed009p1046"
Weeks, Mary Elvira(1932)."The discovery of the elements: X.The alkaline eart metals and magnesium and cadmium".Journal of Chemical Education 9 (6): 1046–1057.Bibcode""Bibcode 1932JChEd...9.1046W""doi:10.1021/ed009p1046"
Steinhauser, Georg; Sterba, Johannes H.; Foster, Michaela; Grass, Friedrich; Bichler, Max (2008). "Heavy metals from pyrotechnics in New Years Eve snow". Atmospheric Environment 42 (37): 8616. "doi:10.1016/j.atmosenv.2008.08.023"