European Community, “Working Document—Biological Treatment of Biowaste,” 2nd Draft, 2001.
 C. Gantzer, L. Gillerman, M. Kuznetsov and G. Oron, “Adsorption and Survival of Faecal Coliforms, Somatic Coliphages and F-Specific RNA Phages in Soil Irrigated with Wastewater,” Water Science and Technology, Vol. 43, No. 12, 2001, pp. 117-124.
 C. Guzmán, J. Jofre, M. Montemayor and F. Lucena, “Occurrence and Levels of Indicators and Selected Pathogens in Different Sludges and Biosolids,” Journal of Applied Microbiology, Vol. 103, No. 6, 2007, pp. 2420-2429.
 A. Pourcher, F. Picard-Bonnaud, V. Ferré, A. Gosinska, V. Stan and G. Moguedet, “Survival of Faecal Indicators and Enteroviruses in Soil after Land-Spreading of Municipal Sewage Sludge,” Applied Soil Ecology, Vol. 35, No. 3, 2007, pp. 473-479.
 P. Payment and E. Franco, “Clostridium perfringens and Somatic Coliphages as Indicators of the Efficiency of Drinking Water Treatment for Viruses and Protozoan Cysts,” Applied and Environmental Microbiology, Vol. 59, No. 8, 1993, pp. 2418-2424.
 B. Jiménez, C. Maya, E. Sánchez, A. Romero, L. Lira and J. A. Barrios, “Comparison of the Quantity and Quality of the Microbiological Content of Sludge in Countries with Low and High Content of Pathogens,” Water Science and Technology, Vol. 46, No. 10, 2002, pp. 17-24.
 L. Mocé-Llivina, M. Muniesa, H. Pimenta-Vale, F. Lucena and J. Jofre, “Survival of Bacterial Indicator Species and Bacteriophages after Thermal Treatment of Sludge and Sewage,” Applied and Environmental Microbiology, Vol. 69, No. 3, 2003, pp. 1452-1456.
 F. Lucena and J. Jofre, “Potential Use of Bacteriophages as Indicators of Water Quality and Wastewater Treatment Processes,” In: P. M. Sabour and M. W. Griffiths, Eds., Bacteriophages in the Control of Food- and Waterborne Pathogens, ASM Press, Washington DC, 2010, pp. 103-118.
 C. Gantzer, P. Gaspard, L. Galvez, A. Huyard, N. Dumouthier and J. Schwartzbrod, “Monitoring of Bacterial and Parasitological Contamination during Various Treatment of Sludge,” Water Research, Vol. 16, No. 16, 2001, pp. 3763-3370.
 P. Gessel, N. Hansen, S. Goyal, L. Johnston and J. Webb, “Persistence of Zoonotic Pathogens in Surface Soil Treated with Different Rates of Liquid Pig Manure,” Applied Soil Ecology, Vol. 25, No. 3, 2004, pp. 237-243.
 WHO, “The Global Burden of Disease. 2004 Update,” World Health Organization, Geneva, 2008.
 A. Prüss-üstün and C. Corvalan, “Preventing Disease through Healthy Environments. Towards an Estimate of the Estimate of the Environmental Burden of Disease,” WHO Press, World Health Organization, Genev, 2006, p. 105.
 J. Lasobras, J. Dellundé, J. Jofre and F. Lucena, “Occurrence and Levels of Phages Proposed as Surrogate Indicators of Enteric Viruses in Different Types of Sludges,” Journal of Applied Microbiology, Vol. 86, No. 4, 1999, pp. 723-729.
 S. Astals, C. Venegas, M. Peces, J. Jofre, F. Lucena and J. Mata-Alvarez, “Balancing Hygienization and Anaerobic Digestion of Raw Sewage Sludge,” Water Research, Vol. 46, No. 19, 2012, pp. 6218-6227.
 K. Cheung, M. Lang and S. Smith, “The Effects of Centrifugation Dewatering on Escherichia coli Numbers in Digested Sewage Sludge,” Proceeding of the Joint CIWEM Aqua Environmental Technology Transfer 8th European Biosolids and Organic Residuals Conference, Wakefield, 24-26 November 2003.
 B. Jimenez, C. Maya and G. Salgado, “The Elimination of Helminth Ova, Faecal Coliforms, Salmonella and Protozoan Cysts by Various Physicochemical Processes in Wastewater and Sludge,” Water Science and Technology, Vol. 43, No. 12, 2001, pp. 179-182.
 C. Bean, J. Hansen, A. Margolin, H. Balkin, G. Batzer and G. Widmer, “Class B Alkaline Stabilization to Achieve Pathogen Inactivation,” International Journal of Research in Public Health, Vol. 4, No. 1, 2007, pp. 53-60.
 R. Gibbs, C. Hu, G. Ho and I. Unkovich, “Regrowth of Faecal Coliforms and Salmonellae in Stored Biosolids and Soil Amended with Biosolids,” Water Science and Technology, Vol. 35, No. 11, 1996, pp. 269-275.
 K. J. Zaleski, K. L. Josephson, C. Gerba and P. Pepper, “Potential Regrowth and Recolonization of Salmonellae and Indicators in Biosolids and Biosolid Amended Soil,” Applied and Environmental Microbiology, Vol. 71, No. 7, 2005, pp. 3701-3708.