1. Y. Kohasaka andF. Takagi:Geometrical duality, effective Regge trajectory and the equivalent highenergy models, Tohoku University preprint TU/71/71 June (1971).
2. Y. Kohsaka andF. Takagi: Dual geometrical model for πN scatterings, Tohoku University preprint TU/71/79 August (1971).
3. M. Imachi, T. Oroguchi, S. Otsuki andF. Toyoda:Progr. Theor. Phys.,45, 1849 (1971).
4. H. Harari:Ann. of Phys.,63, 432 (1971).
5. M. Imachi, S. Otsuki andF. Toyoda:Progr. Theor. Phys.,43, 1105 (1970).