{{cite journal | last1=Broucek | first1=J. | year=2018 | title=Options to methane production abatement in ruminants: a review | journal=Journal of Animal and Plant Sciences | volume=28 | issue=2 | pages=348-364 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2018-JAPS-201}}