Ecology and production of the leeches erpobdella octoculata and erpobdella testacea in lake esrom denmark 

 - Copenhague  Universidad de Copenhague  1979 
 - pp.188-220 
<br/><br/> Dall, P.C. (1979). Ecology and production of the leeches Erpobdella octoculata and Erpobdella testacea SAV. in Lake Esrom Denmark. Archiv fur Hydrobiologie, Supplementband 57(2): 188-220.