By Pica-Ciamarra Ugo   Otte Joachim   in Outlook on Agriculture

ISSN:0030-7270|40|1|7-19

IP Publishing Ltd‎(2011)‎

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By Conforti Piero   Pica-Ciamarra Ugo   in Applied Economics Letters

ISSN:1466-4291|14|9|631-636

Routledge Ltd‎(2007)‎

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