1. Andersen C, Laursen J (1982) Distribution of heavy metals inLumbricus terrestris, Aporrectodea longa and A.rosea measured by atomic absorption and X-ray fluorescence spectrometry. Pedobiologia 24:347?356
2. Arimura S, Iwashita T, Niina Y, Amano H (1980) Effect of earthworm on physical and chemical properties of a satsuma mandarin orchard soil (part 1). Earthworm populations, micromorphological and chemical properties of earthworm casts. J Sci Soil Manure Jpn 51:8?14
3. Beyer WN, Chaney RL, Mulhern BM (1982) Heavy metal concentrations in earthworms from soil amended with sewage sludge. J Environ Qual 11:381?385
4. Darwin C (1881) The formation of vegetable mould through the action of worms. Translated by Shibuya K in 1979, Tatara Shobo, Tottori, 185 pp
5. Gish CD, Christensen RE (1973) Cadmium, nickel, lead, and zinc in earthworms from roadside soil. Environ Sci Technol 7:1061?1062