Erne Helvetica Chimica Acta, 1949 , vol. 32, p. 2205 Full Text Show Details Erlenmeyer; Schmidt Helvetica Chimica Acta, 1946 , vol. 29, p. 1957 Full Text Show Details Erne; Erlenmeyer Helvetica Chimica Acta, 1948 , vol. 31, p. 652,662