The SBL fitting integer order approximation method calculates an integer-order approximate model in the frequency domain by matching the fractional-order derivative and its integer order approximate model to the loci kp and ki obtained in the parametric plane. Users can easily find integer order approximation models of the fractional-order derivatives using the M_SBL function.
 Deniz, F.N., Alagoz, B.B., Tan, N., &Atherton, D.P. (2016). An Integer Order Approximation Method Based on Stability Boundary Locus for Fractional Order Derivative/Integrator Operators. ISA Transactions, 62, 154–163.  Deniz, F.N., Alagoz, B.B., Tan, N., & Koseoglu, M. (2020). Revisiting four approximation methods for fractional order transfer function implementations: Stability preservation, time and frequency response matching analyses. Annual Reviews in Control, 49, 239–257.
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