@inproceedings{Penin:2014Ef,
  author = "Penin, Alexander",
  title = "{Testing Quantum Electrodynamics with Positronium State}",
  doi = "10.22323/1.211.0074",
  booktitle = "Proceedings of Loops and Legs in Quantum Field Theory {\textemdash} PoS(LL2014)",
  year = 2014,
  volume = "211",
  pages = "074"
}