* مؤشرات بيولوجية* تلوث المياه* نقص الأكسجين* Discussion of BOD and COD (use BOD as the keyword in the pdf search function)* Discussion of BOD and COD (use BOD as the keyword in the pdf search function)* More about COD and BOD (scroll to section on "Advantage of using COD over BOD")* Discussion of oxygen demand (use Oxygen Demand as the keywords in the pdf search function)
==External links==* Discussion of BOD and COD (use BOD as the keyword in the pdf search function)* Discussion of BOD and COD (use BOD as the keyword in the pdf search function)* More about COD and BOD (scroll to section on "Advantage of using COD over BOD")