Pérez-Rodríguez, R., Caeiro-Rodriguez, M. and Anido-Rifon, L. (2009) “Design of a Flexible and Adaptable LMS Engine in Conformance with PoEML”, International Journal of Emerging Technologies in Learning (iJET), 4, pp. pp. 12–17. doi: 10.3991/ijet.v4i0.799.