Koichi Yamagata
- The Effect Of Cluster Sampling On The Data Precision Of Person Trip Survey. Dans: 土木学会論文集 (Doboku Gakkai rombunshū), v. 1984, n. 347 (juillet 1984). (1984):
- Laboratories in Urban System Planning Section, Department of Urban and Civil Engineering, Faculty of Engineering, Ibaraki University. Dans: 土木学会論文集 (Doboku Gakkai rombunshū), v. 1991, n. 431 (juillet 1991). (1991):