Emirler, M.T.: 'Graphical two-term control system design considering time delay margin and time-integral performance criterion', Electronics Letters, 2018, 54, (23), p. 1319-1320, DOI: 10.1049/el.2018.6630
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1aea18978r1kc.x-iet-live-01content/journals/10.1049/el.2018.6630