. "Asukai, Masatsune, 1170-1221" . . . . . "Asukai, Masatsune, 1170-1221 Takamatsu no Miya-ke kyū zōhon, Masatsune, Asukai wakashū no honkoku to sono kenkyū" . . . "Tokiwa, Mitsunaga, active 12th century Ban Dainagon ekotoba" . .