We, the Publisher and Editor of Economic Research-Ekonomska Istraživanja, are issuing an Expression of Concern for the following article:
Yongmin Zhang and Yingxue Zhao. (2020). Dynamic behaviour of optimal portfolio with stochastic volatility. Economic Research-Ekonomska Istraživanja, 34(1), 352–367, DOI: 10.1080/1331677X.2020.1788407
After publication of this article, questions concerning authorship were brought to the Publisher and Editor’s attention. Despite an investigation by the Publisher, it has not been possible to fully resolve the questions around authorship. We have therefore referred these concerns to the authors’ institution in order to conduct a full investigation. We will update the article as necessary if further relevant information becomes available.
The authors have been notified about this Expression of Concern.