BUSTAMANTE SIMAS, M. L. D.; DOS SANTOS, N. A. . Narrow-Band 1, 2, 3, 4, 8, 16, 24, 32, 48, 64, and 96 Cycles/360º Angular Frequency Filters. The Spanish Journal of Psychology, v. 9, n. 2, p. 240–248, 24 nov.2006.