Ávila Bernal AG, Bonilla Osorio RS2009Journal article Journal:Ingeniería e InvestigaciónVolume:29Issue:3, Universidad Nacional de Colombia, pp.121 - 127No abstract availableKeywords:51 Physical Sciences , 40 Engineering , 4018 Nanotechnology , 5104 Condensed Matter Physics DOI10.15446/ing.investig.v29n3.15194