In recent years, a study was conducted by Fumihiko GOMI from 1990 to 2000, which deepened the analysis by Kuniji YASHIRO, considering when and by whom those diaries and the written records which became a foundation of "Azuma Kagami" were written.
近年では1990年から2000年までの五味文彦の研究があり、八代国治の分析を更に進める形で、『吾妻鏡』のベースとなった日記、筆録がどの時代の誰であったかの推論を行う。