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2. RIVM;ER Soczó,1986
3. Handbook on soil Clean-up Techniques State Printing Office, The Hague, 1983. (Updated version will be published at the end of 1987) (in Dutch)
4. Eikelboom, D.H., In situ biorestoration of subsoil contaminated with oil products, A literature study. Report no. R 85/230 TNO, Delft 1985 (in Dutch).
5. RIVM;JHAM Verheul,1987