3-MANIFOLD KNOT GENUS is NP-complete. - Ian Agol; Joel Hass; William P. Thurston (CCC, 2002)

3-manifold knot genus is NP-complet. - Ian Agol; Joel Hass; William P. Thurston (STOC, 2002)

Pseudo-Anosov stretch factors and homology of mapping tori. - Ian Agol; Christopher J. Leininger; Dan Margalit (J. Lond. Math. Soc., 2016)