10.1057/palgrave.jcb.3050038
Qualset C.O., 1977, Crop Science, 17, 527, 10.2135/cropsci1977.0011183X001700040011x
Qualset C.O., 1969, Crop Science, 9, 104, 10.2135/cropsci1969.0011183X000900010036x
Bonman J.M., 2005, Crop Science, 45, 1271, 10.2135/cropsci2004.0546