Small isospectral and nonisometric orbifolds of dimension 2 and 3
  Revisiting a construction due to Vigneras, we exhibit small pairs of orbifolds and manifolds of dimension 2 and 3 arising from arithmetic Fuchsian and Kleinian groups that are Laplace isospectral (in fact, representation equivalent) but nonisometric. 
Benjamin Linowitz and John Voight
math.GT math.NT