Чепурный, Я., С. Черняев, and И. Скляров. “Simulation of a Waveguide Turnstile Connection With a Square Waveguide Output for the Incoherent Scatter Radar Antenna”. Radiotekhnika, vol. 3, no. 170, Sept. 2012, pp. 132-6, http://rt.nure.ua/article/view/174971.