1. Pavchich M.P., Balykov B.I. Methods for determining the coefficient of soil filtration. -M.: Energy, 1976. -115 p.
2. Arifzhanov A, Fatkhullaev A, Hydraulic calculation of irrigation canals in an earthen bed. Problems of water agriculture, Tashkent, 2004, pp. 60-62.
3. Karimov R.M. Hydraulic calculation of channels (textbook), Tashkent, 1976, ed. Uzgiprozem.Пaвчич М.П., Бaлыкoв Б.И. Мeтoды oпрeдeлeния кoэффициeнтa фильтрaциигрунтoв. -М.: Энeргия, 1976. -115с
4. Increasing heat efficiency by changing the section area of the heat transfer pipelines