J. Sawollek

On Alexander-Conway Polynomials for Virtual Knots and Links

J. Sawollek, 1999, math/9912173.

An Orientation-Sensitive Vassiliev Invariant for Virtual Knots

J. Sawollek, 2002, math/0203123.

Alternating diagrams of 4-regular graphs in 3-space

Jörg Sawollek, J. Sawollek, 1999 .

Embeddings of 4-Regular Graphs into 3-Space

J. Sawollek, 1997 .