Левандовський, В.Г. 2012. “Engineering of Lightguide With Enlarged Effective Area for Telecommunication Lines”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 44 (October):48-53. https://doi.org/10.20535/RADAP.2011.44.48-53.