Higher Education for All. From Challenges to Novel Technology-Enhanced Solutions First International Workshop on Social, Semantic, Adaptive and Gamification Techniques and Technologies for Distance Learning, HEFA 2017, Maceió, Brazil, March 20-24, 2017, Revised Selected Papers - Cristea, Alexandra I.; Cristea, Alexandra I.; Bittencourt, Ig Ibert; Bittencourt, Ig Ibert; Lima, Fernanda; Lima, Fernanda (Springer International Publishing : Imprint: Springer, 2018)