Graphene-Doped Tin Oxide Nanofibers and Nanoribbons as Gas Sensors to Detect Biomarkers of Different Diseases through the Breath. - Carlos Sánchez-Vicente; José Pedro Santos; Jesús Lozano; Isabel Sayago; José Luis Sanjurjo; Alfredo Azabal; Santiago Ruiz-Valdepeñas (Sensors, 2020)