@misc{indiciaed3da020a339b,
  title = {Pyruvic acid as an etching agent.},
  author = {D H Retief and J Bischoff and E H van der Merwe},
  year = {1976},
  doi = {10.1111/j.1365-2842.1976.tb00950.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/789829/},
  note = {Source identifier: 789829}
}