Jagniatinskis, Aleksandras, and Boris Fiks. “Investigation of the Accuracy in Laboratory Sound Insulation Measurements Laboratorinių Garso Izoliavimo Matavimų Tikslumo Tyrimai”. Journal of Civil Engineering and Management, vol. 6, no. 3, June 2000, pp. 202-5, https://doi.org/10.3846/13921525.2000.10531587.