@article{Brittberg1994autologous,
  author = {Brittberg and Lindahl and Nilsson and others},
  title = {Treatment of Deep Cartilage Defects in the Knee with Autologous Chondrocyte Transplantation},
  journal = {New England Journal of Medicine},
  year = {1994},
  doi = {10.1056/NEJM199410063311401},
  url = {https://doi.org/10.1056/NEJM199410063311401}
}

@article{Johnson2012kartogenin,
  author = {Johnson and Zhu and Tremblay and others},
  title = {A Stem Cell–Based Approach to Cartilage Repair},
  journal = {Science},
  year = {2012},
  doi = {10.1126/science.1215157},
  url = {https://doi.org/10.1126/science.1215157}
}