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] S. D. Liao, On the topology of cyclic products of spheres, Trans. Amer. Math. Soc., 77 (1954), 520-551. [2] I. Tamura, On Pontrjagin classes and homotopy types of manifolds, J. Math. Soc. Japan, 9 (1957), 250-262. [3] I. Tamura, Characteristic classes of M-spaces I, J. Math. Soc. Japan, 11 (1959), 312-342. [4] I. Tamura, Characteristic classes of M-spaces II (to appear).