ANALYTIC INVARIANTS OF BOUNDARY LINKS
Stavros Garoufalidis, Jerome Levine · Journal of Knot Theory and Its Ramifications · 2002
Using basic topology and linear algebra, we define a plethora of invariants of boundary links whose values are power series with noncommuting variables. These turn out to be useful and elementary reformulations of an invariant originally defined by M. Farber [Fa2].