Shuji Yamanaka, Toshikazu Arai, Anju Sawada, Akira Fukuda, and Hideki Yayama, Oscillation mode transformation of edge magnetoplasmons in two-dimensional electron system on liquid-helium surface: Электроны и ионы над/в сверхтекучем гелии, Low Temp. Phys. 39, (2013) [Fiz. Nizk. Temp. 39, 1086-1095, (2013)] DOI: https://doi.org/10.1063/1.4823489 .