Immersed spheres inCP2 andS2×S2

[1]  A. Tristram.  Some cobordism invariants for links , 1969, Mathematical Proceedings of the Cambridge Philosophical Society.

[2]  J. M. Boardman.  Some embeddings of 2-spheres in 4-manifolds , 1964, Mathematical Proceedings of the Cambridge Philosophical Society.

[3]  J. Milnor,et al.  ON 2-SPHERES IN 4-MANIFOLDS. , 1961, Proceedings of the National Academy of Sciences of the United States of America.

[4]  Ken'ichi Kuga.  Representing homology classes of S2 × S2 , 1984 .

[5]  S. Donaldson,et al.  A new proof of a theorem of Narasimhan and Seshadri , 1983 .

[6]  V. Rokhlin.  Two-dimensional submanifolds of four-dimensional manifolds , 1971 .