Please refer to a book by Yasuhiko NISHIKAWA, "The Empress Teimei: the world of her waka (Japanese poetry) and poems; Collections of poetry by the Empress Teimei", published from Kinseisha in 2007.
西川泰彦『貞明皇后その御歌と御詩の世界－貞明皇后御集拝読』錦正社2007年を参照。