Prikhodko, O.O., and Y.M. Bidasyuk. “Projected Gross–Pitaevskii Equation for Ring-Shaped Bose–Einstein Condensates”. Ukrainian Journal of Physics 66, no. 3 (April 7, 2021): 198. Accessed April 14, 2021. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2020018.