Bansal, S., Garg, A., Khurana, R., & Bansal, A. (1969). Primary orofacial granulomatous involvement of lip and gingiva only: A diagnostic challenge. Journal of Indian Society of Periodontology, 24(6), 575-578. https://doi.org/10.4103/jisp.jisp_18_20 (Original work published 1969)