University, diversity, interdependence IAU 1950-1990 / 
a commemorative essay byGeorges Daillant. 
 - Paris :  IAU,  1990. 
 - 209 p. 
<br/><br/><label>ISBN: </label>9290021535 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>378.4 (100)=20 "1990" UNI.