Rao, G. N., Kulkarni, G. B., Gururaj, G., Rajesh, K., Subbakrishna, D. K., Steiner, T. J., & Stovner, L. J. (2012). The burden of headache disorders in India: Methodology and questionnaire validation for a community-based survey in Karnataka State. Springer Milan.

Rao, Girish N., Girish B. Kulkarni, Gopalkrishna Gururaj, Kavita Rajesh, D. Kumaraswamy Subbakrishna, Timothy J. Steiner, a Lars J. Stovner. The Burden of Headache Disorders in India: Methodology and Questionnaire Validation for a Community-based Survey in Karnataka State. Springer Milan, 2012.

Rao, Girish N., et al. The Burden of Headache Disorders in India: Methodology and Questionnaire Validation for a Community-based Survey in Karnataka State. Springer Milan, 2012.