Brooks, RobertEliashberg, YakovMcMullen, Curtis2009-12-211990Brooks, Robert, Yakov Eliashberg, and Curtis T. McMullen. 1990. The spectral geometry of flat disks. Duke Mathematical Journal 61(1): 119–132.0012-7094http://nrs.harvard.edu/urn-3:HUL.InstRepos:3446033en-USThe Spectral Geometry of Flat DisksJournal Article2009-12-2110.1215/S0012-7094-90-06106-X