@techreport{oai:soar-ir.repo.nii.ac.jp:00016991,
 author = {吉田,  利男},
 month = {Mar},
 note = {The characteristics of the composition of the aquatic animal communities in the upper and mid streams，N agano Pref. under natural ∞nditions and artificial impacts added such as pollution or river conservancy，w ere analyzed. We have determinedthe communities of biotic index which can be assessed as such environments. lndex communities are shown as followed., Article, 環境科学年報11:61-78(1989)},
 title = {長野県内河川の底生動物群集の指標化による環境評価の試み},
 year = {1989}
}