Interactions between hydrology and nutrient runoff in small agricultural catchments. A comparative study of Estonian, Latvian and Norwegian catchmentsDeelstra, Johannes; Vagstad, Nils; Loigu, Enn; Vassiljev, Anatoli; Jansons, ViestursXX Nordic Hydrological Conference, Helsinki, Finland, 10-13 August, 1998. Vol. 11998 / p. 120-128: ill