Kruszyński, W., J. Dawidowicz, D. Andraka, and J. Tomaszewska. “Application and Digital Implementation GIS Data to Computer Modeling of the Sanitary Sewage Network in Podlaskie Voivodship”. Economics and Environment, vol. 65, no. 2, Mar. 2018, p. 9, https://ekonomiaisrodowisko.pl/journal/article/view/160.