@article{GDZPPN002069865,
title = {Unknotting tunnels in two-bridge knot and link complements.},
journal = {Commentarii mathematici Helvetici},
volume = {71},
year = {1996},
pages = {617-627},
zbl = {0873.57006},
url = {http://dml.mathdoc.fr/item/GDZPPN002069865}
}
Reid, Alan W.; Adams, Colin C. Unknotting tunnels in two-bridge knot and link complements.. Commentarii mathematici Helvetici, Tome 71 (1996) pp. 617-627. http://gdmltest.u-ga.fr/item/GDZPPN002069865/