For example, the possible author of "Koyagire (Fragment from Kokin Waka Shu Poetry Anthology), Second Class" was believed to be KI no Tsuyayuki, but it has become clear that it was written by MINAMOTO no Kaneyuki.
例えば、『高野切第二種』の伝称筆者は紀貫之であるが、源兼行の筆跡であることが判明している。