T. Jena, M. Kumar Debnath, P. Prasad Ray, and S. Kumar Sanyal, “Optimal 2-DOF PID controller design for load frequency control with various nonlinearities”, IJET, vol. 7, no. 2.33, pp. 955–959, Jun. 2018, doi: 10.14419/ijet.v7i2.33.15541.