Curvo Filho, Plácido Flaviano <br/><br/>
Analysis of the informal communication patterns among professionals in agricultural research and extension service activities (submitted in partial fulfillment of the requirements for the decree of doctor of philosophy)  DOC/TEC/024/84 

 - Brasilia, DF (Brasil):   1984.  
 - 246 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PESQUISA AGRICOLA<br/>EXTENSAO RURAL