Rosen, Marc A.; Koohi-Fayegh, Seama: 'Cogeneration and District Energy Systems: Modelling, Analysis and Optimization' (Energy Engineering, 2016) DOI: 
IET Digital Library, https://digital-library.theiet.org/;jsessionid=5188stodjln13.x-iet-live-01content/books/po/pbpo093e