Saorí­n, Tomás, and Juan-Antonio Pastor-Sánchez. “From Mobile-First to Data-First: Schema.Org, Zero-Click Searches and the Uncertainty about Voice Assistants”. Anuario ThinkEPI 14 (May 10, 2020). Accessed May 7, 2026. https://thinkepi.scimagoepi.com/index.php/ThinkEPI/article/view/thinkepi.2020.e14f04.