2017 https://www.sciencedirect.com/science/article/pii/S0016328715300665?casa_token=Dy7MjRY9EWQAAAAA:Kpv1LGdUXzuXLzqkegc_KQv9uS96uqgMyFwN-0bqRCYq1DhZr7f-DRBMvXf5E4D5Dn2AYyhCYmGW Academic paper Medium
2017 https://www.sciencedirect.com/science/article/pii/S0016328715300665?casa_token=Dy7MjRY9EWQAAAAA:Kpv1LGdUXzuXLzqkegc_KQv9uS96uqgMyFwN-0bqRCYq1DhZr7f-DRBMvXf5E4D5Dn2AYyhCYmGW Academic paper Medium