@CONFERENCE\{IMM2000-01166, author = "O. Bang and C. B. Clausen and L. Torner", title = "Effective nonlinearities in modulated {QPM} gratings", year = "2000", pages = "5-6", booktitle = "{DOPS} Nyt - Danish Optical Society News, Special issue on Northern Optics 2000", volume = "15", series = "", editor = "", publisher = "Danish Optical Society", organization = "", address = "", url = "http://www2.compute.dtu.dk/pubdb/pubs/1166-full.html" }