Bujňák, L., Marcin, A., Naď, P., & Mihok, T. (2020). Effect of supplemental humic acid with urea as a non protein dietary nitrogen source on rumen variables in sheep. Animal Welfare, Etológia és Tartástechnológia (AWETH), 16(1), 1-7. https://doi.org/10.17205/SZIE.AWETH.2020.1.001