TY JOUR TI Mathematical modelling of operational managmentwater-rasing stations KW mathematical modelling KW elevator pump KW water feed JO Actual directions of scientific researches of the XXI century: theory and practice AU Purusova, I.. AU Shcherbakova, V.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov