REFERENCES
- Roots (W K) & Wu (C). Controlled Boiler Stability. IEEE Trans. IECI-16, 2; 1969; 133–135.
- Ziegler (J G) & Nichols (N B). Process Lags in Automatic Control Circuits. Trans ASME. 65, 5; 1943; 433–444.
- Patranabis (D). Principles of Process Control. 1976. Tata McGraw-Hill, New Delhi, P 70–75.