Hartman, M., Pohořelý, M., & Trnka, O. (2006). Chemical and Fuel Characteristics of Anaerobically Stabilized Sewage Sludge and Its Ash. Chemické Listy, 100(9). Získáno z http://w-ww.chemicke-listy.cz/ojs3/index.php/chemicke-listy/article/view/1888