Thoms; Heynen Chem. Zentralbl., 1927 , vol. 98, # I p. 2729 Full Text Show Details Thoms; Heynen Festschrift fuer A. Tschirch , S. 217, 219 Full Text Show Details Pfau Helvetica Chimica Acta, 1928 , vol. 11, p. 873