Цурко, Д. and Старков, М. 2011. A simple lower bound of estimating of the checking symbols quantity. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia. 46 (Oct. 2011), 100-104. DOI:https://doi.org/10.20535/RADAP.2011.46.100-104.