@article{busch:1998:tco,
    author = {Busch, Thomas and Englert, Berthold-Georg and Rza{\. z}ewski, Kazimierz
          and Wilkens, Martin},
     title = {Two cold atoms in a harmonic trap},
   journal = {Found. Phys.},
  fjournal = {Foundations of Physics},
    volume = {28},
      year = {1998},
    number = {4},
     pages = {549–559},
       doi = {10.1023/A:1018705520999}}