Chuman, T., & Arunsawatwong, S. (2014). Criterion of Approximation for Designing 2 × 2 Feedback Systems with Inputs Satisfying Bounding Conditions. ECTI Transactions on Electrical Engineering, Electronics, and Communications, 13(1), 1–10. https://doi.org/10.37936/ecti-eec.2015131.170968