Pérez, Elisa, Luis Miguel Nunes, Ángela Conchillo, and Miguel Ángel Recarte. 2008. “Mental workload and visual impairment: differences between pupil, blink, and subjective rating”. The Spanish Journal of Psychology 11, nº 2:: 374-85. https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0808220374A