International Association for Hydraulic Research.Congress of hte IAHR (17th : 1977 : Baden-Baden, F. R. G.).V.6:Hydraulic engineering for improved water management.[s. n.],n. d..
International Association for Hydraulic Research.Congress of the IAHR (17th : 1977 : Baden-Baden, F. R. G.).V.5:Hydraulic engineering for improved water management.[s. n.],n. d..