Evolution of X-ray and optical rapid variability during the low/hard state in the 2018 outburst of MAXI J1820+070 = ASASSN-18ey. - Kimura, Mariko; Negoro, Hitoshi; Yamada, Shinya; Iwakiri, Wataru; Sako, Shigeyuki; Ohsawa, Ryou (Publications of the Astronomical Society of Japan, 2025)