https://ideas.repec.org/a/ris/ecoint/0072.html
Convergence Clubs of State-Level Agricultural Productivity in the U.S.A
Downloadable! The objective of the present study is to investigate empirically the existence of convergence clubs in state-level agricultural productivity of...
the u sconvergence clubsstate levelagricultural productivity
https://www.econstor.eu/handle/10419/19412
EconStor: Testing for convergence clubs in income per-capita: A predictive density approach
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income per capita