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Filippini, Massimo 
ORCID: 0000-0002-5972-4439 and Wetzel, Heike
(2014).
The impact of ownership unbundling on cost efficiency: Empirical evidence from the New Zealand electricity distribution sector.
Energy Econ., 45.
S. 412 - 419.
AMSTERDAM:
ELSEVIER SCIENCE BV.
ISSN 1873-6181
Germeshausen, Robert, Panke, Timo and Wetzel, Heike (2020). Firm characteristics and the ability to exercise market power: empirical evidence from the iron ore market. Empir. Econ., 58 (5). S. 2223 - 2248. HEIDELBERG: PHYSICA-VERLAG GMBH & CO. ISSN 1435-8921
Growitsch, Christian, Malischek, Raimund, Nick, Sebastian and Wetzel, Heike (2015). The Costs of Power Interruptions in Germany: A Regional and Sectoral Analysis. Ger. Econ. Rev., 16 (3). S. 307 - 324. HOBOKEN: WILEY-BLACKWELL. ISSN 1468-0475
Krautzberger, Lisann and Wetzel, Heike (2012). Transport and CO2: Productivity Growth and Carbon Dioxide Emissions in the European Commercial Transport Industry. Environ. Resour. Econ., 53 (3). S. 435 - 455. NEW YORK: SPRINGER. ISSN 0924-6460
Kruse, Juergen and Wetzel, Heike (2016). Energy Prices, Technological Knowledge, and Innovation in Green Energy Technologies: a Dynamic Panel Analysis of European Patent Data. CESifo Econ. Stud., 62 (3). S. 397 - 426. OXFORD: OXFORD UNIV PRESS. ISSN 1612-7501
Nick, Sebastian and Wetzel, Heike (2016). The hidden cost of investment: the impact of adjustment costs on firm performance measurement and regulation. J. Regul. Econ., 49 (1). S. 33 - 56. DORDRECHT: SPRINGER. ISSN 1573-0468
Olivares, Maria and Wetzel, Heike (2014). Competing in the Higher Education Market: Empirical Evidence for Economies of Scale and Scope in German Higher Education Institutions. CESifo Econ. Stud., 60 (4). S. 653 - 681. OXFORD: OXFORD UNIV PRESS. ISSN 1612-7501