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Astatine. Wikipedia. Retrieved from https://en.wikipedia.org/wiki/Astatine.
Berta Karlik. Wikipedia. Retrieved from https://en.wikipedia.org/wiki/Berta_Karlik.
Wong, C.W. (No date). Berta Karlik. Retrieved from http://cwp.library.ucla.edu/Phase2/Karlik,[email protected].
Astatine (No date). Retrieved from http://www.chemistryexplained.com/elements/A-C/Astatine.html.
Astatine (No date). Retrieved from http://www.rsc.org/periodic-table/element/85/astatine.
Astatine. Wikipedia. Retrieved from https://en.wikipedia.org/wiki/Astatine.
Berta Karlik. Wikipedia. Retrieved from https://en.wikipedia.org/wiki/Berta_Karlik.
Wong, C.W. (No date). Berta Karlik. Retrieved from http://cwp.library.ucla.edu/Phase2/Karlik,[email protected].