Roland, Conrad <br/><br/>
Frei Otto - structures / 
by Conrad Roland ; translated by C.V. Amerongen. 
 - London :  Longman Group,  c1965. 
 - viii, 74 p. : ill. 
<br/><br/><label>ISBN: </label>0582507081 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Structural design.<br/>Otto, Frei, 1925 -<br/>Architects--German.