1. Studies on the Chemical Nature of Vitamin A
2. Takahashi, K., Nakamiya, Z., Kawakami, K., and Kitasato, P., Scientific papers of Institute of Physical and Chemical Research, Komagome, Hongo, Tokyo, 1925, iii, 81. Takahashi, K., British patent 220,697, Aug. 14, 1924.
3. Further observations on the chemistry of cod liver oil