Maximal cusps, collars, and systoles in hyperbolic surfaces Colin Adams 32G1530F35maximal cusphyperbolic surfacescollarssystolespunctured surface Indiana University Mathematics Journal 1998 text pdf 10.1512/iumj.1998.47.1506 10.1512/iumj.1998.47.1506 en Indiana Univ. Math. J. 47 (1998) 419 - 438 state-of-the-art mathematics http://iumj.org/access/