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Re:PID Controller for controlling the number of servers in a... by lmilcin on Monday July 05, 2021 @09:33AM (#27737795)
I am using Optimal Control Theory An Introduction from Donald Kirk and Modern Control Engineering from Katsuhiko Ogata.

Both are heavy in math, but are not that difficult (I studied theoretical math some 20 years ago and I can read them).

Re:PID Controller for controlling the number of servers in a... by deepspace on Monday July 05, 2021 @03:08PM (#27740967)
I recommend Ogata as well. Another classic.