@article{Popescu:2023ch,
  author = "Popescu, Sebastian  and  Constantinescu, Radu  and  Dimitrijević, Dragoljub D.  and  Djordjević, Goran S.  and  Vourlias, Kostas  and  Zhekova, Maya",
  title = "{The Balkan Physics Olympiad – a little piece of history}",
  doi = "10.22323/1.427.0251",
  journal = "PoS",
  year = 2023,
  volume = "BPU11",
  pages = "251"
}