Jun Zhang, Alfred M. Blackmer, Jason W. Ellsworth and Kenneth J. Koehler
Agronomy Journal 100 ( 3 ): 543 - 550 , 2008
Jun Zhanga, Alfred M. Blackmer, Jason W. Ellsworth, Peter M. Kyveryga and Tracy M. Blackmer
Agronomy Journal 100 ( 3 ): 658 - 664 , 2008