TWISTED TORUS KNOTS WITH GRAPH MANIFOLD DEHN SURGERIES

In this paper, we classify all twisted torus knots which are doubly middle Seifert-fibered. Also we show that all of these knots possibly except a few admit Dehn surgery producing a non-Seifert-fibered graph manifold which consists of two Seifert-fibered spaces over the disk with two exceptional fibers, glued together along their boundaries. This provides another infinite family of knots in S-3 admitting Dehn surgery yielding such manifolds as done in [5].