How to interweave accessibility with didactic and technological quality of digital educational materials - Moreno Lopez, Lourdes; Fernandez-pampillon, Ana Maria; Sarasa, Antonio; Rodrigo, Covadonga; Garcia-villalobos, Julian; Gonzalez, Yolanda; Garcia-mata, Ricardo (Journal of Accessibility and Design for All (Journal of Accessibility and Design for All), 2019)