Analysis of the positions of regulation of C-11 transmitters in teleelectronic works "Telcom-Telfa" in Bydgoszcz from the point of view of visual hygiene - Weiss, Jolanta; Kałużny, Józef; Lisiewska-Junk, Hanna (Klinika Oczna / Acta Ophthalmologica Polonica, 1992)