訂正日: 2006/08/29訂正理由: -訂正箇所: 引用文献情報訂正内容: Right : 1) M. S. Knebelman: On groups of motions in related spaces. Amer. Jour. of Math., 52 (1930), 280-282. 2) K. Yano: Groups of transformations in generalized spaces, in press. 3) M. S. Knebelman: Collineations of projectively related affine connections. Annals of Math., 29 (1928), 389-394.