Similar title to Zwirnmann, K.-H. (1981). Analysis and control of nonpoint nitrate pollution of municipal water supply sources. In: Quality of Groundwater. Eds. van Duijvenbooden, W., Glasbergen, P., & van Lelyveld, H., pp. 1115-1120 Oxford, UK: Pergamon Press. ISBN 978-0-444-42022-0 10.1016/S0166-1116(08)72032-6.