1. Andrade Neto CO (2004) Anaerobic filter applied for the treatment of domestic sewage. Ph.D. Thesis, Federal University of Campina Grande, Brazil. In Portuguese.
2. Campos JR (1999) Treatment of Domestic Sewage by Anaerobic Process and Controlled Disposal on Land. Finep, CNPq & Caixa (Program Prosab), ABES, Rio de Janeiro, Brazil. In Portuguese
3. Chernicharo CAL (2003) Post-treatment of Anaerobic Reactor Effluents. Finep, CNPq & Caixa (Program Prosab), Belo Horizonte, Brazil. In Portuguese
4. The UASB reactor as an alternative for the septic tank for on-site sewage treatment