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Breitung, Joerg and Hafner, Christian M. (2016). A simple model for now-casting volatility series. Int. J. Forecast., 32 (4). S. 1247 - 1256. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1872-8200
Hafner, Christian M., Manner, Hans and Simar, Leopold (2018). The wrong skewness problem in stochastic frontier models: A new approach. Econom. Rev., 37 (4). S. 380 - 401. PHILADELPHIA: TAYLOR & FRANCIS INC. ISSN 1532-4168