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https://www.sciencedirect.com/science/article/pii/S0896627301003592
https://www.sciencedirect.com/science/article/pii/S1364661300018453?casa_token=DhNI1TVbY1kAAAAA:bqdr_2m9rBJ618yu9fl2HGAu7nCvvyFw5knLEHWdBtOpEVCs0aF-6qHBuhAjAzOFdictBB4VvQ
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