분모 분자가 같은 차수일 경우 state space
https://lpsa.swarthmore.edu/Representations/SysRepTransformations/TF2SS_CCF_OCF_hard.html
Control Systems Engineering 문제
이런저런 생각
https://lpsa.swarthmore.edu/Representations/SysRepTransformations/TF2SS_CCF_OCF_hard.html