Valencia, D.C., Bran-Piedraita, L., Osorio, A.O., Lucia Palacios Moya and Alejandro Valencia Arias 2018. Research Trends in Relation to the Orientation of the University Research Centers: Perspectives from the Bibliometric Analysis. European Journal of Education. 1, 2 (Jul. 2018), 77–87. DOI:https://doi.org/10.26417/ejed.v1i2.p77-87.