
REFERENCES

S. A. Bleiler, A note on unknotting number, Math. Proc. Camb. Phil. Soc. 96 (1984) 469471.
D. Garity, Unknotting numbers are not realized in minimal projections for a class of rational knots. Proceedings of the "II ItalianSpanish Congress on General Topology and its Applications" (Trieste, 1999). Rend. Istit. Mat. Univ. Trieste 32 (2001), suppl. 2, 5972 (2002).
Y. Nakanishi, Unknotting numbers and knot diagrams with the minimum crossings, Math. Sem. Notes Kobe Univ. 11 (1983) 257258.
