1. I. Kimura, Proceedings of Asian Pacific Weed Science Society, 3rd Conference, Kuala Lumpur (unpublished) (1971).
2. I. Kimura, N. Ichizen, Y. Nakamura, H. Sugiyama and I. Okuda, Abstracts of Papers, 9th Meeting of Nippon Zassô Kenkyûkai, p.24 (1970).
3. N. Ichizen, Y. Nakamura and I. Kimura,Proceedings of the Crop Science Society of Japan,41, (Extra issue 1), 145 (1972).
4. Y. Nakamura, N. Ichizen, I. Kimura, H. Sugiyama and I. Okuda, Abstracts of Papers, 8th Meeting of Nippon Zassô Kenkyûkai, p. 9 (1969).