Sjaastad, Ottar; Bakketeig, Leiv S. (December 22, 2004). “Hangover headache: accompanying symptoms. Vågå study of headache epidemiology”. The Journal of Headache and Pain (Springer Milan) 5 (4): 224-229. doi:10.1007/s10194-004-0130-5. ISSN1129-2369.
Durlach, Jean; Hirotoshi Morii, Yoshiki Nishizawa (March 6, 2007). “10: Clinical forms of Magnesium Depletion by Photosensitization and Treatment with Scototherapy”. New Perspectives in Magnesium Research. Springer London. pp. 117-126. doi:10.1007/978-1-84628-483-0_10. ISBN978-1-84628-388-8
Sjaastad, Ottar; Bakketeig, Leiv S. (December 22, 2004). “Hangover headache: accompanying symptoms. Vågå study of headache epidemiology”. The Journal of Headache and Pain (Springer Milan) 5 (4): 224-229. doi:10.1007/s10194-004-0130-5. ISSN1129-2369.