Preckel, Paul V.; Hertel, Thomas W.; Arndt, Channing; Nin, Alejandro (2003-11-01). "Bridging the Gap between Partial and Total Factor Productivity Measures Using Directional Distance Functions". American Journal of Agricultural Economics. 85 (4): 928–942. doi:10.1111/1467-8276.00498. hdl:10.1111/1467-8276.00498. ISSN0002-9092. S2CID154456202.
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Preckel, Paul V.; Hertel, Thomas W.; Arndt, Channing; Nin, Alejandro (2003-11-01). "Bridging the Gap between Partial and Total Factor Productivity Measures Using Directional Distance Functions". American Journal of Agricultural Economics. 85 (4): 928–942. doi:10.1111/1467-8276.00498. hdl:10.1111/1467-8276.00498. ISSN0002-9092. S2CID154456202.
Preckel, Paul V.; Hertel, Thomas W.; Arndt, Channing; Nin, Alejandro (2003-11-01). "Bridging the Gap between Partial and Total Factor Productivity Measures Using Directional Distance Functions". American Journal of Agricultural Economics. 85 (4): 928–942. doi:10.1111/1467-8276.00498. hdl:10.1111/1467-8276.00498. ISSN0002-9092. S2CID154456202.
Preckel, Paul V.; Hertel, Thomas W.; Arndt, Channing; Nin, Alejandro (2003-11-01). "Bridging the Gap between Partial and Total Factor Productivity Measures Using Directional Distance Functions". American Journal of Agricultural Economics. 85 (4): 928–942. doi:10.1111/1467-8276.00498. hdl:10.1111/1467-8276.00498. ISSN0002-9092. S2CID154456202.