Bequette, B. Wayne (2003). Process control: modeling, design, and simulation. Prentice Hall. p. 735. ISBN 978-0-13-353640-9. 978-0-13-353640-9 ↩
Love, Jonathan (2007). Process automation handbook: a guide to theory and practice. Springer. p. 28. ISBN 978-1-84628-281-2. 978-1-84628-281-2 ↩