T. Wiangtong, S. Prongnuch, and S. Sitjongsataporn "Stochastic Behaviour Analysis of Adaptive Averaging Step-size Sign Normalised Hammerstein Spline Adaptive Filtering", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 577–586, 2021, doi: 10.25046/aj060162.