Watton, J., and N. Freebody. “A TIME ENCODED SIGNAL PROCESSING/NEURAL NETWORK APPROACH TO FAULT CLASSIFICATION OF AN ELECTROHYDRAULIC CONTROL SYSTEM”. International Journal of Fluid Power, vol. 1, no. 2, Oct. 2000, pp. 59-66, https://journals.riverpublishers.com/index.php/IJFP/article/view/652.