Koval Vadym Petrovich. Increase of energy efficiency of light sources with the coiled tungsten elements : к.т.н. : spec.. 05.09.07 - Світлотехніка та джерела світла : presented. 2009-05-28; popup.evolution: .; Ternopil Ivan Pul'uj State Technical University. – , 0409U002792.

Updated: 2026-10-20