International agricultural research systems

1989 ◽  
Vol 3 (4) ◽  
pp. 257-260 ◽  
Author(s):  
J Anderson
1992 ◽  
Vol 23 (1) ◽  
pp. 169-190 ◽  
Author(s):  
J. Roseboom ◽  
P. G. Pardey

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