Anderson, Jack R. <br/><br/>
Variability of cereal yields; sources of change and implications for agricultural research policy 

<br/><br/> Sobretiro de : Food Policy 12 (3) : 199-212, 1987 
<br/><br/><label>LCCN: </label>67004 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cereales--Rendimiento.<br/>Política agrícola.