2007 - 2009 Methodological Relocation of the Constitutional History in the Occident and Japan-From the Viewpoint of Historical Source Research and Learning-History.
2005 - 2008 12世紀ドイツにおける法の構造変動の総合的研究-中世中期の王権を中心に
2006 - 2008 Power-structure and identities in Medieval Europe
2001 - 2005 ボーダレス化時代における法システムの再構築
2002 - 2004 中世中期ヨーロッパにおける文字文化の展開と法--史料論と構造論の架橋の試み
1998 - 2001 近代国家の形成における訴訟法・訴訟制度の変革と役割
1999 - 2000 Formation, Development and Transformation of the Modern Law - Comparative Studies of Europe, China and Japan -
1998 - 2000 National Language, National History and Original Law : Formation and Development of National Self-Consciousness in the Law
1996 - 1998 Comparative Study on the Political Power Structure in Medieval Europe
1996 - 1997 Procedural Law and Public authority in Medieval Italy
1995 - 1997 General Survey of historical materials on the Medieval Europe
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Papers (47):
Nishikawa Yoichi. "Materialistischer HIstorismus" und die Geschichte des mittelalterlichen Staates. Ein DDR-Historiker auf der Such nach einer Nationalgeschichte. The journal of the Association of Political and Social Sciences. 2022. 135. 3/4. 1-77
Nishikawa Yoichi. "Materialistischer HIstorismus" und die Geschichte des mittelalterlichen Staates. Ein DDR-Historiker auf der Such nach einer Nationalgeschichte. The journal of the Association of Political and Social Sciences. 2022. 135. 1/2. 1-77
Yoichi Nishikawa. Was war die "Demokratisierung der Justiz" in der früheren Deutschen Demokratischen Republik (2). The Journal of the Association of Political and Social Sciences. 2020. 133. 1/2. 1-68