Lefebvre, D.R., Dhar, S., Lee, I., Allard, F. and Freitag, S.K. 2015. External dacryocystorhinostomy outcomes in patients with a history of dacryocystitis. Digital Journal of Ophthalmology. 21, 3 (Sep. 2015), 40–48. DOI:https://doi.org/10.5693/djo.01.2014.08.001.