Parker, Don: 'Improving plant automation and operational flexibility' (Energy Engineering, 2018), 'Thermal Power Plant Control and Instrumentation: The control of boilers and HRSGs.', Chap. 11, pp. 273-291, DOI: 10.1049/PBPO119E_ch11
IET Digital Library, https://digital-library.theiet.org/;jsessionid=3qctpg6vuq7il.x-iet-live-01content/books/10.1049/pbpo119e_ch11