1] dr Ernesto Hontoria USE A TWO STAGE ANAEROBIC DIGESTOR TO IMPROVE THE CONVENTIONAL MESOPHILIC ANAEROBIC DIGESTION PROCESS" - XI Savjetovanje hemičara, tehnologa i ekologa Republike Srpske, 29.06.2016.
(https://ekonferencije.com/en/paper/use-a-two-stage-anaerobic-dige/4477)