@misc{indiciae8d6179d2b106,
  title = {On the modified Westergaard equations for certain plane crack problems.},
  author = {Eftis, J. and Liebowitz, H.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730030434},
  note = {Source identifier: 19730030434}
}