1. K. Honda, Sci. Rep. Tohoku Univ., 4 (1915) 97.
2. W. V. Farrar, K. R. Farrar and E. L. Scott, Ambix, 21 (1974) 40 and 179
3. E. Shimao, Isis, 63 (1972) 309.
4. Y. Tsuzuki and A. Yamashita, Japanese Studies in the History of Science 4 (1965) 41
5. R. C. Mackenzie, C. J. Keattch, D. Dollimore, J. F. Forrester, A. A. Hodgson and J. P. Redfern Talanta, 19 (1972) 1079.