1. Romoli M (2010) Auricular acupuncture diagnosis. Churchill Livingstone, Elsevier, Edinburgh
2. Romoli M, Allais G, Airola G, Benedetto C (2005) Ear acupuncture in the control of migraine pain: selecting the right acupoints by the ‘needle-contact test’. Neurol Sci 26(Suppl 2):158–161
3. Headache Classification Subcommittee of the International Headache Society (2004) The International Classification of Headache Disorders: 2nd edn. Cephalalgia 24(Suppl. 1):9–169
4. Nogier PFM (1972) Treatise of auriculotherapy. Maisonneuve, Moulins-les-Metz
5. Technical Supervise Bureau of State (1993) The nomenclature and location of ear acupuncture points. Chinese Standard Publishing House, Beijing