Verification of DEMNIP on data from the hupselse beek research basin : Contribution to the conf.on hydrological research basins and the environment and third general meet.of the European network of experimental and represintative basins Wageningen, 24-28 Sept.1990 / E.F.Ruygh,P.S.Grashoff,C.F.Hopstaken,J.P.M.Witte, 1990. - 10 p.