Nihar Ranjan Biswal, Rashmi Rekha Mallick, and Chinmayee Swain. “Clinical Spectrum of Primary Headache Disorders at a Tertiary-Care Hospital in Eastern India: A Prospective Observational Study: Spectrum of Primary Headache Disorders”. Advances in Clinical Medical Research, vol. 6, no. 3, Sept. 2025, pp. 6-11, http://www.acmrjournal.com/index.php/ACMR/article/view/86.