Bustamante Simas, Maria Lúcia de, and Natanael Antonio Dos Santos. “Narrow-Band 1, 2, 3, 4, 8, 16, 24, 32, 48, 64, and 96 Cycles 360º Angular Frequency Filters”. The Spanish Journal of Psychology, vol. 9, no. 2, Nov. 2006, pp. 240-8, https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0606220240A.