Madgwick, F.J. (1999). "Restoring nutrient-enriched shallow lakes: Integration of theory and practice in the Norfolk Broads, U.K.". Shallow Lakes '98. Vol. 408–409. pp. 1–12. doi:10.1007/978-94-017-2986-4_1. ISBN978-90-481-5370-1. {{cite book}}: |journal= ignored (help)