http://ci.nii.ac.jp/els/110000999500.pdf?id=ART0001179015&type=pdf&lang=en&host=cinii&order_no=&ppv_type=&lang_sw=&no=1491888088&cp=

http://ci.nii.ac.jp/els/110001877782.pdf?id=ART0002052547&type=pdf&lang=en&host=cinii&order_no=&ppv_type=&lang_sw=&no=1491888203&cp=