@misc{indiciae1aa2135b8c96,
  title = {Implementing universal vaccination programmes: Bulgaria.},
  author = {N Gatcheva and N Vladimirova and A Kourtchatova},
  year = {1995},
  doi = {10.1016/0264-410x(95)80062-i},
  url = {https://pubmed.ncbi.nlm.nih.gov/7571842/},
  note = {Source identifier: 7571842}
}