This is the case of research carried out by Azocar et al. 2008, Díaz 2005, Garín et al. 2009, and Toledo et al. 2000, among other, are important contributions.
Tal es el caso de las investigaciones conducidas por Azócar et al. 2008, Díaz 2005, Garín et al. 2009, Toledo et al. 2000, entre otras de singular valor.