Economic growth and environmental efficiency: Evidence from U.S. regions. Economics Letters 120 (1): 48-52

Economic growth and environmental efficiency: Evidence from U.S. regions. Economics Letters 120 (1): 48-52 (SCOPUS, EconLit, ISI Listed: Impact factor: 0.581 and 5-year: 0.902). In common with N. Tzeremes  (2013).