1. BENNDORF, J., 1988. Objectives and unsolved problems in ecotechnology and biomanipulation: a preface. Limnologica, 19:5–8.
2. BENEKEN-KOLMER, C.M., 1987. Species composition and grazing pressure of the zooplankton in the recreation pool ‘Zwemlust’. Report 1987-18, Limnological Institute, Nieuwersluis (in Dutch).
3. EJSMONT-KARABIN, J., R.D. GULATI and J. ROOTH. Is food availability the main factor controllingEuchlanis dilatata lucksiana Hauer abundance in a shallow, hypertrophic lake? Hydrobiologia (in press).
4. GRIMM, M.P., 1989. Northern pike (Esox lucius L.) and aquatic vegetation, tools in the management of fisheries and water quality in shallow waters. Hydrobiol. Bull., 23: 59–65.
5. GULATI, R.D., 1978. The ecology of common planktonic crustacea of the freshwaters in The Netherlands. Hydrobiologia, 59: 101–112.