Dahl, N. J., P. L. Muntal, and M. A. E. . Andersen. “Time-Based High-Pass, Low-Pass, Shelf, and Notch Filters”. Elektronika Ir Elektrotechnika, vol. 29, no. 6, Dec. 2023, pp. 33-40, doi:10.5755/j02.eie.35277.