1. Armitage, P. D., 1978. Some notes on the food of chironomid larvae of a shallow woodland lake in South Finland. Ann. zool. fenn. 5: 6?13.
2. Barr, A. J., Goodnight, J. M., Sall, J. P. & Helwig, J. T., 1976. A User's Guide to SAS. SAS Institute Inc. 93 pp.
3. Beck, W. M., 1977. Environmental requirements and pollution tolerance of common freshwater Chironomidae. EPA-600/4?77?024. 260 pp.
4. Brennan, A., McLachlan, A. J. & Wotton, R. S., 1978. Particulate material and midge larvae (Chironomidae, Diptera) in an upland river. Hydrobiologia 59: 67?74.
5. Brock, E. M., 1960. Mutualism between the midge Cricotopus and the alga Nostoc. Ecology 41: 474?483.