Author(s): Pisati, Maurizio

Pp: 361-378Publication: The Stata JournalbrPublished: 2004Published date: 2004Vol: 4Issue: 4DOI: 10.1177/1536867X0400400401URL: https://ageconsearch.umn.edu/bitstream/116257/2/sjart_gr0008.pdfPublication: The Stata Journal

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