1. Über Viergeflechte;Bankwitz;Abh. Math. Sem. Univ. Hamburg,1934
2. Heegaard splittings and branched coverings of B3;Bleiler;Math. Ann.,1988
3. F. Bonahon, L. Siebenmann, Geometric splittings of classical knots and Conway's algebraic knots, unpublished notes, 1980
4. J.E. Brody, On the Fox invariant, PhD thesis, Princeton University, 1954
5. The topological classification of the lens spaces;Brody;Ann. of Math.,1960