  We consider Sturm-Liouville operators on the line segment [0, 1] with general
regular singular potentials and separated boundary conditions. We establish
existence and a formula for the associated zeta-determinant in terms of the
Wronski- determinant of a fundamental system of solutions adapted to the
boundary conditions. This generalizes the earlier work of the first author,
treating general regular singular potentials but only the Dirichlet boundary
conditions at the singular end, and the recent results by Kirsten-Loya-Park for
general separated boundary conditions but only special regular singular
potentials.
