Манько, О.О., Шматок, О.С. and Петренко, А.Б. 2017. The use of passive optical devices for the protection of information in fiber-optic communication lines and networks. Ukrainian Information Security Research Journal. 19, 2 (Jun. 2017), 143–147. DOI:https://doi.org/10.18372/2410-7840.19.11685.