5Hajimew,Nobuyukim,Hiroyukio, et al. Structure and design of ladder sleeper[J]. New Railway Structure, 2002,56 (3) : 26--28.
6Hajimew, Nobuyuki,Hiroyukio, et al. Performance ：nd application of ballast ladder track[J]. New Rail- zay Structure, 2002,56 (4) : 32--34.
7Hiroyukio,Masamichis,Nobuyukim, et al. Environ- mental performance improvement of railway structural system using ladder track [R]. Research Report of Railway Technical Research Institute,2003.
8Hajimew, Nobuykim. Performance test of ballasted ladder track at TTCI and floating ladder track in Japan [R]. Transportation Research Board Annual Meeting, 2002.
