Ubieto Artur A-P. “4R” sustainability and quality teaching using Free Software: Teaching experience in the "Degree in Information and Documentation" of the University of Zaragoza ((1992-)2008-2022). revTECHNO [Internet]. 2022 Nov. 23 [cited 2025 Jun. 4];11(3):1-12. Available from: https://historicoeagora.net/revTECHNO/article/view/3794