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, see also Gibbs, Cohen and Cannan (1925). 



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, see also Cohen, Chambers and Reznikoff (1928). 



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 Charles, J. H., see Birkinshaw, Charles and Clutterbuck (1931). 

 Chen, T. T., see Ball and Chen (1933). 



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 -, see also Ball and Clark (1931). 



Cannan, Cohen and Clark (1920). 

 Cohen, Gibbs and Clark (1924, 1, 2). 

 Gibbs, Cohen and Clark (1925). 

 Hellerman, Perkins and Clark (1933). 

 Phillips, Clark and Cohen (1927). 

 Stiehler and Clark (1933). 

 Sullivan, Cohen and Clark (1923). 



