Singh, A., Singh, S., Saxena, S., Kumar, S., Banga, A., & Purohit, N. (1969). Polarized microscope assisted study of collagen fibres in Oral Submucous Fibrosis and their clinicopathologic correlation: An in-vitro study. Journal of Oral Biology and Craniofacial Research, 8(3), 206-211. https://doi.org/10.1016/j.jobcr.2017.07.001 (Original work published 1969)