Humboldt-Universität zu Berlin | Wirtschaftswissenschaftliche Fakultät | High Dimensional Nonstationary Time Series | About us | News Feed | News 2018 | Dissertation: A. Petukhina completes PhD Dissertation: A. Petukhina completes PhD 29.06.2018 Dissertation: Alla A. Petukhina completes PhD 29.06.2018. Alla A. Petukhina defended her PhD dissertation on the "Tail event driven asset allocation strategies for high-dimensional portfolios". Congratulations!