Casas-Limón J, Aledo-Serrano Á, Abarrategui B, Cuadrado ML. Greater Occipital Nerve Blockade: A Safe and Effective Option for the Acute Treatment of Hemiplegic Aura. Headache. 2015 Jul-Aug;55(7):1000-3. doi: 10.1111/head.12607. PubMed PMID: 26140423.