Colman, Ian; Brown, Michael D.; et al. (1. 4. 2005). „Parenteral Dihydroergotamine for Acute Migraine Headache: A Systematic Review of the Literature”. Annals of Emergency Medicine. 45 (4): 393—401. PMID15795718. doi:10.1016/j.annemergmed.2004.07.430.
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Colman, Ian; Brown, Michael D.; et al. (1. 4. 2005). „Parenteral Dihydroergotamine for Acute Migraine Headache: A Systematic Review of the Literature”. Annals of Emergency Medicine. 45 (4): 393—401. PMID15795718. doi:10.1016/j.annemergmed.2004.07.430.