%0 Journal Article %T From normal science to scientific revolutions %A Cristhian David Morales-Plaza %A Jorge Enrique Machado-Alba %J Revista M¨¦dica de Risaralda %D 2012 %I Universidad Tecnol¨®gica de Pereira %X N/A. %K Ciencia %K Revoluci¨®n %U http://revistas.utp.edu.co/index.php/revistamedica/article/view/7929/4815