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Preventive Medicine > 2013 > 57 > 4 > 258-264
Preventive Medicine > 2013 > 57 > 5 > 721-724
Papers in Regional Science > 89 > 1 > 3 - 25
Agricultural Economics > 2002 > 27 > 3 > 201-216
Journal of Geographical Systems > 2000 > 2 > 1 > 11-15