Schaffer Maike, Petersen, Søren O. ja Filser, Juliane: Effects of Lumbricus terrestris, Allolobophora chlorotica and Eisenia fetida on microbial community dynamics in oil-contaminated soil. Soil biology & biochemistry, 2005, s. 2065–2076. Elsevier Science. Artikkelin verkkoversio. (englanniksi)[vanhentunut linkki]