Weeks, Mary Elvira (1933). »The discovery of the elements. XIX. The radioactive elements«. Journal of Chemical Education. 10 (2): 79. Bibcode:1933JChEd..10...79W. doi:10.1021/ed010p79.
Weeks, Mary Elvira (1933). »The discovery of the elements. XIX. The radioactive elements«. Journal of Chemical Education. 10 (2): 79. Bibcode:1933JChEd..10...79W. doi:10.1021/ed010p79.
Weeks, Mary Elvira (1933). »The discovery of the elements. XIX. The radioactive elements«. Journal of Chemical Education. 10 (2): 79. Bibcode:1933JChEd..10...79W. doi:10.1021/ed010p79.
Weeks, Mary Elvira (1933). »The discovery of the elements. XIX. The radioactive elements«. Journal of Chemical Education. 10 (2): 79. Bibcode:1933JChEd..10...79W. doi:10.1021/ed010p79.