1. Amberger A, Vilsmeier K and Gutser R (1982) Stickstofffraktionen verschiedener Güllen und deren Wirkung im Pflanzenversuch. Zeitschrift für Pflanzenernährung und Bodenkunde 145, 325–336
2. Dijk H van (1982) Some notes on the importance of mineralization and immobilization of nitrogen in making fertilizer recommendations. Colloquium Humus-Azote (Reims), pp 151–160. ISSS Association Française pour l’étude du sol, INRA
3. Faassen H G van (1979) Prospects for re-feeding aerobically treated liquid pig manure. In Hawkins J C, ed. Engineering problems with effluents from livestock. Proceedings of a CEC seminar (Cambridge, UK), pp 233–253. Luxembourg: Bureau Official Publications European Community
4. Faassen H G van and Dijk H van (1975) Oxidation-nitrification and denitrification of veal calf manure. In Managing livestock wastes. Proceedings of the third international Symposium on Livestock wastes, pp 314–317. St. Joseph, Michigan: ASAE
5. Faassen H G van and Dijk H van (1979) Nitrogen conversions during the composting of manure/straw mixtures. In Grossbard E, ed. Straw decay and its effects on disposal and utilization, pp 113–120. Chichester, UK: Wiley & Sons