Update README.md

Dlloydev · Jul 24, 2022 · 94147e1 · 94147e1
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 #### References
 
-- [Comparison of PID Controller Tuning Methods](http://www.ie.tec.ac.cr/einteriano/analisis/clase/13.1.Zomorrodi_Shahrokhi_PID_Tunning_Comparison.pdf)
+- [Comparison of PID Controller Tuning Methods](http://maulana.lecture.ub.ac.id/files/2014/12/Jurnal-PID_Tunning_Comparison.pdf)
 - [Ziegler-Nichols Open-Loop Tuning Rules](https://blog.opticontrols.com/archives/477)
 - [Inflection point](https://en.wikipedia.org/wiki/Inflection_point)
 - [Time Constant (Re: Step response with arbitrary initial conditions)](https://en.wikipedia.org/wiki/Time_constant)