@misc{indiciaeedc101087861,
  title = {Convergence and error estimates in the ray method for the solution of some seepage problems},
  author = {Budak, B. M. and Vasilev, F. P.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660017353},
  note = {Source identifier: 19660017353}
}