Нелін, Є.А. and Шульга, А.В. 2015. Criteria of impedance inhomogeneities approaching by delta-inhomogeneities. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia. 63 (Dec. 2015), 127-135. DOI:https://doi.org/10.20535/RADAP.2015.63.127-135.