33. Nacionalna konferencija procesna tehnika i energetika u poljoprivredi PTEP 2021, 18-23.04.2021. Vršac, Srbija-Zbornik apstrakata, 2021; 33th National conference processing and energy in agriculture PTEP 2021, 18-23.04.2021. Vršac, Srbija-Book of abstracts