{{cite journal | last1=Gao | first1=Z. Q. | author2=Z. Q. Li | year=2015 | title=LIGHT USE EFFICIENCY DISTRIBUTION AS A FUNCTION OF DIFFERENT TREE SHAPES IN APPLE | journal=Journal of Animal and Plant Sciences | volume=25 | issue=3 | pages=247-253 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2015-JAPS-337}}