Willis. D. R. <br/><br/>
Near-free molecule drag of slender cones / 
D. R. Willis. 
 - California : Rand Corporation,  1970. 
 - iii, 55 pages ;  28 cm. 
 - The Rand paper series ;  p.4521 .
 - Rand paper series ;  p.4521 .
<br/><br/>Includes bibliographical references.