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Human Capital, Migration, and Regional Income Convergence in the Philippines
Toya, Hideaki, (2004)
Nenkochingin ha seisansei to kairishiteiruka: Kogyochosa, chinginkozokihonchosa kohyo data niyoru jissho bunseki [in Japanese]
Kawaguchi, Daiji, (2006)
Asia Shokoku no Kinkoukawase reito (in Japanese)
Miyagawa, Tsutomu, (2004)