Darryl McCullough, MR2326947 (a review of: Cannon, James W.; Thurston, William P. 'Group invariant Peano curves'. Geom. Topol. 11 (2007), 1315–1355), MathSciNet; Quote::This influential paper dates from the mid-1980s. Indeed, preprint versions are referenced in more than 30 published articles, going back as early as 1990"