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Investigations into the occurrence of midge plagues in the vicinity of Harderwijk (Netherlands)Limnological Studies on Tjeukemeer - a typical Dutch "polder reservoir"Distribution and production of the larval Chironomid populations in TjeukemeerA modification of the Ekman-Birge bottom sampler for heavy dutyLife cycle and changes in carbohydrates, proteins and lipids of Pentapedilum uncinatum Goet (Diptera Chironomidae)The "open water" chironomid fauna of Tjeukemeer (Abstract)Chironomid investigations in the 'open water' of TjeukemeerPopulation dynamics and biomass production of Neomysis integer (Leach) in the BergumermeerThe IBP project of the Limnological Institute (Tjeukemeer), bottom faunaAn introduction to the limnology of the Friesian lakes