To find peer reviewed research papers, it is better to use journal database (or specialized search engine), not only just google. In the following, selected search engine and journal databases are listed:
Please also refer to Osaka University library database page大阪大学図書館のデータベースのページ.
I suggest to manage the papers using a software such as Mendelay and Zotero. You can find many other useful softwares (but many others are not free).