Rodríguez-Iturbe, Ignacio. <br/><br/>
investigation of relationship between hydrologic time serie-s and sunspot numbers / by Ignacio Rodríguez-Iturbe , Vujic-a Yevjevich. 

 - Fort Collins, Colorado : CSU 
 - 49 p. 
 - Hydrology papers ; no. 26 / Colorado State University .