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15. Nitroglycerin headache and nitroglycerin-induced primary headaches from 1846 and onwards: a historical overview and an update. Tfelt-Hansen PC, Tfelt-Hansen J. Headache; 2009 Mar 27; 49(3):445-56. PubMed ID: 19267787 [Abstract] [Full Text] [Related]
18. History of the use of ergotamine and dihydroergotamine in migraine from 1906 and onward. Tfelt-Hansen PC, Koehler PJ. Cephalalgia; 2008 Aug 27; 28(8):877-86. PubMed ID: 18460007 [Abstract] [Full Text] [Related]
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