1. Verotoxinogenic E. coli (VTEC) O157:H7—A nation-wide Swedish survey of bovine faeces;Albihn;Acta. Vet. Scand.,2003
2. Hygienic recommendations and reduction of pathogenic microorganisms in Danish biogas plants;Bendixen;Dansk Vet. Tidskr.,1996
3. Bendixen, H.J., 1999. Hygienic safety—results of scientific investigations in Denmark. IEA Bioenergy Workshop, Hohenheim, Germany, pp. 27–47.
4. Böhm, R., Martens, W., Philipp, W., 1999. Regulation in Germany and results of investigations concerning hygienic safety of processing biowastes in biogas plants. IEA Bioenergy Workshop, Hohenheim, Germany. pp. 48–61.
5. Occurrence of Listeria monocytogenes in sewage sludge;De Luca;Zentralbl. Hyg. Umveltmed.,1998