1. Aizaki, M., A. Otsuki, T. Fukushima, T. Kawai, M. Hosomi and K. Muraoka 1981. Application of Carlson's trophic state index to Japanese lakes and relationships between the index and other parameters. Verhandlungen der Internationalen Vereinigung für Limnologie, 21, 643–649.
2. Alm, G. 1922. Bottenfauna och fiskens bioligi i Yxtasjön samt jämforande studier över bottenfauna och fiskavkastning i vara sjöar. Medd Landbtuksstyr, 236: 1–186.
3. Annandale, N. 1918. Zoological results of a tour in the Far East. Memoirs of the Asiatic Society of Bengal, 6: 199–216.
4. Annandale, N. 1922. The macroscopic fauna of Lake Biwa. Annotationes Zoologicae Japonenese, 10: 127–153.
5. Aston R. J. 1973. Tubificids and water quality: a review. Environmental Pollution, 5: 1–10.