@Misc{SCI:Bal2021a,
  author =    "M. K. Ballard and R. Amici and V. Shankar and L.
              A. Ferguson and M. Braginsky and R. M. Kirby",
  title =     "Towards an Extrinsic, CG-XFEM Approach Based on
              Hierarchical Enrichments for Modeling Progressive
              Fracture",
  subtitle =  "arXiv preprint arXiv:2104.14704",
  year =      "2021",
  url =       "http://www.sci.utah.edu/publications/Bal2021a/2104.14704.pdf",
}