@article{Nockel:94,
	Author = {J. U. N{\"o}ckel and A. D. Stone and R. K. Chang},
	Journal = {Opt. Lett.},
	Number = {21},
	Pages = {1693--1695},
	Title = {Q spoiling and directionality in deformed ring cavities},
	Volume = {19},
	Year = {1994}}