Ecological Economics · 2007 · 84 citations · 59 references
EngineeringEnvironmental SciencesHealth SciencesEnvironmental HealthTunnel EngineeringTunneling EngineeringTunnel DesignTunnelingEnvironmental Kuznets CurveRisk Assessment In TunnelingTunneling Impacts
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Testing for unit roots in heterogeneous panels
Kyung So Im, M. Hashem Pesaran, Yongcheol Shin · Journal of Econometrics · 2003 · 15K citations · Full text