Hantzsch; Wolvekamp Justus Liebigs Annalen der Chemie, 1904 , vol. 331, p. 279 Full Text Show Details Atkinson Journal of the Chemical Society, 1877 , vol. 32, p. 254 Journal of the Chemical Society, 1880 , vol. 37, p. 226 Full Text View citing articles Show Details Voelckel Justus Liebigs Annalen der Chemie, 1842 , vol. 43, p. 76,83