00363cam a2200169   450000500170000024500260001702000150004310000260005804400130008425000090009704100080010630000230011450000050013783000050014226000270014708200190017420260711133909.0  aAnálisis de redesb  a9681801784  aVan Valkenburg, M. E.  aMéxico  a1ª   aspa  a636 p. il.; 24 cm.  a  v  aMéxico D.F. bc1989  a621.319bV217a