author = { Becker, WJ AND Purdy, RA },

title = { Medication Overuse Headache in Canada },

publisher = {SAGE Publications},

isbn = {0333-1024},

isbn = {1468-2982},

keywords = { Neurology (clinical) , General Medicine },

year = {2008},

url = { http://slubdd.de/katalog?TN_libero_mab2 }