00401nam a2200145 a 450000500170000000800410001703500190005810000400007722200360011724500410015336200160019490400150021090500130022599900170023820210219153256.0991125n                      000 0 spa u  aUPN01000087993  aVera, Cesar A. y Francisco Parra S.  aREVISTA COLOMBIANA DE EDUCACION  aMicrocentros y formacion de docentes  a1990 no. 21  aACb025804  aArticulo  c72791d72791