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2. Casson, A.J., Gordon, C. Mc A.: On slice knots in dimension three. Proc. Symp. in Pure Math. XXX, part two 39?53 (1978)
3. Gilmer, P.M.: Configurations of Surfaces in 4-manifolds. Trans. Amer. Math. Soc.264, 353?380 (1981)
4. Gilmer, P.M.: Slice Knots inS 3. Preprint
5. Lect. Notes in Math.;C. Mc A. Gordon,1978