Comparative study of risks at night work of postal workers and security service
Tint, Piia
Shiftwork international newsletter
1997
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1, p. 99
Öö ja töö piiride hägustumisest
Hazak, Aaro
Studioosus
2017
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lk. 16-19
https://www.ester.ee/record=b1558644*est