Gutierrez-Leefmans, Manuela, and Christopher Patrick Holland. “SME Platforms As Business Models: A User-Centric Activity-System Approach”. Cuadernos de Administración 35, no. 64 (May 15, 2019): 52–77. Accessed January 19, 2025. https://ojs.h-novigo.com/index.php/cuadernos_de_administracion/article/view/7248.