Effect of humic acid substances on proteolytic activity in intestine, digestibility of crude protein and protein content in the blood of broiler chickens [elektronický zdroj] / Andrej Marcin ... [et al.] .
In: Acta fytotechnica et zootechnica. -- ISSN 1335-258X. -- Vol. 24, mimoriadne č. (2021), s. 159-163
https://doi.org/10.15414/afz.2021.24.mi-prap.159-163 .