Kymi Water and Environment District -Helsinki, FI

Helsinki, F.I.Kymi Water & Helsinki, F.I.Plancenter, 1994. Water protection measures for the Neva river catchment area to ensure water supply for St. Petersburg : pre-feasibility study, Helsinki, Finland: Plancenter. Available at: https://pt.ircwash.org/sites/default/files/821-RUST94-12382.pdf.