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)