@article{AoyamaGrueneSemmleretal.2011,
  author    = {Hideaki Aoyama and Lars Gr{\"u}ne and Willi Semmler and Yoshi Fujiwara and Wataru Souma},
  title     = {Fluctuation of firm size in the long-run and bimodal distribution},
  journal   = {Advances in operations research},
  volume    = {2011},
  number    = {Art. 269239},
  pages     = {1 -- 21},
  doi       = {10.1155/2011/269239},
  year      = {2011},
}