@article{lichard2020possible,
  author = {Lichard, P.},
  title = {Possible manifestation of the 2p pionium in particle physics processes},
  journal = {Physical Review D},
  publisher = {American Physical Society (APS)},
  volume = {102},
  number = {7},
  pages = {073004},
  year = {2020},
  doi = {10.1103/PhysRevD.102.073004},
  issn = {1550-7998}
}