CITATIONS

Term: double pterygium
Http://: https://www.merckmanuals.com/professional/eye-disorders/conjunctival-and-scleral-disorders/pinguecula-and-pterygium
Http://: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5598180/
Http://: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5340105/