Heathfield, David F <br/><br/>
Production functions 
David F. Heathfield 
 - London  MacMillan  1971 
 - 91 p. ; 21 cm. 
<br/><br/>p. 87-91 
<br/><br/><label>ISBN: </label>0333128400 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Production (Economic theory)--Mathematical models