@misc{indiciae56603c99b854,
  title = {Optical scalars and singularity avoidance in spherical spacetimes.},
  author = {E Malec and Ó Murchadha N},
  year = {1994},
  doi = {10.1103/physrevd.50.r6033},
  url = {https://pubmed.ncbi.nlm.nih.gov/10017641/},
  note = {Source identifier: 10017641}
}