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3. The relative atomic weight of oxygen in water and air;Dole;J. Am. Chem. Soc.,1935
4. Explanation of the relatively large concentration of O18 in the atmosphere;Green;J. Am. Chem. Soc.,1936
5. 5. Vrooman, R. H. , 1948: M. Sc. Thesis, Mc Master Univ., Canada.