@article{161,
  author = {Leonard Gray and Anh-Vu Phan and Glaucio Paulino and T Kaplan},
  title = {Improved quarter-point crack tip element},
  year = {2003},
  journal = {Engineering Fracture Mechanics},
  volume = {70},
  number = {2},
  pages = {269{\textendash}283},
  publisher = {Elsevier},
}