Robert, Gerard; Michaud, Frederic: 'Reduced order models for grid connected hydropower plants' (Energy Engineering, 2017), 'Modeling and Dynamic Behaviour of Hydropower Plants', Chap. 3, pp. 49-78, DOI: 10.1049/PBPO100E_ch3
IET Digital Library, https://digital-library.theiet.org/;jsessionid=5grvquqkfvv3f.x-iet-live-01content/books/10.1049/pbpo100e_ch3