@book{CTT100412212,
  author = {HIDEKI OHTA},
  title = {Introduction to Soil Strength and Ground Failure, Introduction Series No. 13},
  publisher = {The Japanese Society of Soil Mech. & Found. Engrg},
  year = 1987,
}

@article{CTT100412213,
  author = {HIDEKI OHTA},
  title = {A determination procedure of input parameters in elasto-viscoplastic finite element analysis},
  journal = {Soils & Foundations},
  year = 1987,
}