Lindsley, David; Parker, Don: 'Setting the demand for the steam generator' (Energy Engineering, 2018), 'Thermal Power Plant Control and Instrumentation: The control of boilers and HRSGs.', Chap. 4, pp. 67-79, DOI: 10.1049/PBPO119E_ch4
IET Digital Library, https://digital-library.theiet.org/;jsessionid=3qpsvpbwbspea.x-iet-live-01content/books/10.1049/pbpo119e_ch4