TY JOUR TI R&D of the PERT basic model for project planning KW PERT KW network model KW planning KW backup time KW critical path JO Modeling of systems and processes AU Novikova, T.P. AU Evdokimova, S.A. AU Novikov, A.I. PY 2022 IS 14 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov