Rojas, J. H., Zapata, H., Alzate, A. and Rodríguez, Álvaro (1) “Vacunal cover in children 12 to 47 months old of social and economic 1 and 2 layers in the urban zone of Cali, year 2002.”, Colombia Médica, 39(1), pp. 66-73. doi: 10.25100/cm.v39i1.551.