Two-dimensional submanifolds of four-dimensional manifolds

[1]  W. Massey Proof of a conjecture of Whitney. , 1969 .

[2]  A. Tristram Some cobordism invariants for links , 1969, 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]  Armand Borel,et al.  Seminar on Transformation Groups. , 1961 .