10. Thygesen J., Aaen K., Theodorsen F., et al. Short–term effect of latanoprost and timolol eye drops on tear fluid and the ocular surface in patients with primary open–angle glaucoma and ocular hypertension. // Acta Ophthalmol. – 2000. – Vol.78, №1. – P. 37–44.
11. Tseng S.C.G. Evaluation of the ocular surface in dry – eye conditions // Intern. Ophthalmol. Clin.– 1994.– Vol.34, №1. – P. 57–69.
12. Van Bijsterveld O.P. Diagnostic tests in the sicca syndrome // Arch. Ophthalmol. – 1969. – Vol.82, №1. – P.10–14.