Feasibility of intravenous ketamine infusion for refractory headache. Headache Medicine, [S. l.], v. 10, n. 3, p. 70–72, 2019. DOI: 10.48208/HeadacheMed.2019.20. Disponível em: https://headachemedicine.com.br/hm/article/view/28. Acesso em: 22 jan. 2026.