Це Link не існує на вашій мові, Переглянути в: English (en),
Або використовуйте Google Translate:  

https://biyogazder.org/makaleler/mak07.pdf

This information service on biogas technology has been developed and produced on the order of the GTZ project Information and Advisory Service on Appropriate Technology (ISAT) for the ISAT Website in a collaborative effort. Information within this document includes the basics of biogas, the history of biogas technology, biogas appliances, and much more.