@misc{indiciae258dfe64bea6,
  title = {Passive and active overlay systems.},
  author = {Carlalberta Verna and S Troiani and C Luzi and Birte Melsen},
  year = {2004},
  url = {https://pubmed.ncbi.nlm.nih.gov/15665442/},
  note = {Source identifier: 15665442}
}