The “S” curve relationship between export diversity and economic size of countries

@article{Hu2011TheC,
  title={The “S” curve relationship between export diversity and economic size of countries},
  author={Lunchao Hu and Kailan Tian and Xin Wang and Jiang Zhang},
  journal={Physica A-statistical Mechanics and Its Applications},
  year={2011},
  volume={391},
  pages={731-739}
}

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