@misc{indiciae777290894532,
  title = {On the symbolic manipulation and code generation for elasto-plastic material matrices},
  author = {Chang, T. Y. and Saleeb, A. F. and Wang, P. S. and Tan, H. Q.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920002157},
  note = {Source identifier: 19920002157}
}