Ayuso, N. Fillola, E. Masiá, B. Murillo, A.C. Trillo, R. Baldassarri, S. Cerezo, E. Ruberte, L. Mariscal, M.D. Villarroya, M. Gender gap in STEM: a cross-sectional study of primary school students’ self-perception and test anxiety in mathematics IEEE trans. ed. 10.1109/TE.2020.3004075 2020 2020