@article{Nockel:07,
	Author = {Jens U. N{\"o}ckel},
	Journal = {Opt. Express},
	Number = {9},
	Pages = {5761--5774},
	Title = {Modified Gouy phase in optical resonators with mixed boundary conditions, via the Born-Oppenheimer method},
	Volume = {15},
	Year = {2007}}