H. Yokohira
- The planning of the railroad line and the excution of work at JR SENMOU main line in Hokkaido. In: Historical Studies in Civil Engineering, v. 15 ( 1995). (1995):
- The railroad line and the form of JR SENMO main line in Hokkaido. In: Historical Studies in Civil Engineering, v. 14 ( 1994). (1994):
- The forming processes of early railroad network stage in KITAMrIe gion, Hokkaido (1910-'21). In: Historical Studies in Civil Engineering, v. 13 ( 1993). (1993):