1. Africa Biogas Partnership Programme;ABPP,2017
2. Panorama Dos Resíduos Sólidos No Brasil 2003, São Paulo;ABRELPE,2003
3. Panorama Dos Resíduos Sólidos No Brasill 2015, São Paulo;ABRELPE,2015
4. Visible light photocatalytic disintegration of waste activated sludge for enhancing biogas production;Anjum;J. Environ. Manag.,2018
5. Bioenergy in Germany – facts and figures on development, support and investment;Appunn;Clean Energy Wire,2016