Lahl U., Zeschmar B., Gabel B., Kozicki R., Podbielski A., Stachel B., Struss S.: Ground-water pollution by nitrate. Proceedings of an International Symposium. UNESCO – IAH – IAHS, 1159-1170, 1983
Lahl U., Zeschmar B., Gabel B., Kozicki R., Podbielski A., Stachel B., Struss S.: Ground-water pollution by nitrate. Proceedings of an International Symposium. UNESCO – IAH – IAHS, 1159-1170, 1983