Haku
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Studies on the nitrogen compounds of the faeces od dairy cows fed urea as the sole or partial source of nitrogen
(Suomen maataloustieteellinen seura, 1979)
The composition of the faecal microbial flora of milking cows on feeds containing urea as the sole or partial source of nitrogen
(Suomen maataloustieteellinen seura, 1980)
On the amino acids in the urine of dairy cows fed urea as the sole or partial source of nitrogen
(Suomen maataloustieteellinen seura, 1977)