Nitrogen application, balances and their effect on water quality in small catchments in the Nordic–Baltic countriesBechmann, Marianne; Blicher-Mathiesen, Gitte; Kyllmar, Katarina; Iital, Arvo; Lagzdins, Ainis; Salo, TapioAgriculture, ecosystems and environment2014 / p. 104-113 : ill Possible agricultural use of digestateKuusik, Argo; Pachel, Karin; Kuusik, Aare; Loigu, EnnProceedings of the Estonian Academy of Sciences2017 / p. 64-74 : ill https://doi.org/10.3176/proc.2017.1.10 http://www.ester.ee/record=b2355998*est