Orbifolds of Maximal Diameter Joseph Borzellino Indiana University Mathematics Journal 1993 text pdf 10.1512/iumj.1993.42.42004 10.1512/iumj.1993.42.42004 en Indiana Univ. Math. J. 42 (1993) 37 - 53 state-of-the-art mathematics http://iumj.org/access/