Patel, S; Henderson, R; Bradley, L; Galloway, B; Hunter, L (November 1991). "Effect of visual display unit use on blink rate and tear stability". Optometry and Vision Science. 68 (11): 888–92. doi:10.1097/00006324-199111000-00010. PMID1766652. S2CID43391738.
Gur, S; Ron, S (1992). "Does work with visual display units impair visual activities after work?". Documenta Ophthalmologica. Advances in Ophthalmology. 79 (3): 253–9. doi:10.1007/BF00158255. PMID1600842. S2CID33719708.
Patel, S; Henderson, R; Bradley, L; Galloway, B; Hunter, L (November 1991). "Effect of visual display unit use on blink rate and tear stability". Optometry and Vision Science. 68 (11): 888–92. doi:10.1097/00006324-199111000-00010. PMID1766652. S2CID43391738.
Gur, S; Ron, S (1992). "Does work with visual display units impair visual activities after work?". Documenta Ophthalmologica. Advances in Ophthalmology. 79 (3): 253–9. doi:10.1007/BF00158255. PMID1600842. S2CID33719708.
Patel, S; Henderson, R; Bradley, L; Galloway, B; Hunter, L (November 1991). "Effect of visual display unit use on blink rate and tear stability". Optometry and Vision Science. 68 (11): 888–92. doi:10.1097/00006324-199111000-00010. PMID1766652. S2CID43391738.
Gur, S; Ron, S (1992). "Does work with visual display units impair visual activities after work?". Documenta Ophthalmologica. Advances in Ophthalmology. 79 (3): 253–9. doi:10.1007/BF00158255. PMID1600842. S2CID33719708.