@article{pasquali_nota_langer_schulte-ladbeck_clampin_2000, 
  title={R4 and Its Circumstellar Nebula: Evidence for a Binary Merger?}, 
  volume={119}, 
  DOI={10.1086/301257}, 
  publisher={IOP Publishing}, 
  author={Pasquali and Nota and Langer and Schulte-Ladbeck and Clampin}, 
  year={2000}
  }