1. At-risk populations to unintentional and intentional fentanyl and fentanyl+ exposure

   • Andrew R. Thomas
   • Robert M. Schwartz

   OriginalPaper 13 July 2019 Pages: 73 - 82

2. Civil unmanned aircraft systems and security: The European approach

   • Mikko Huttunen

   OriginalPaper Open access 23 September 2019 Pages: 83 - 101

3. Modeling traveler recovery time following man-made incidents: the case of the Athens metro

   • Christina Milioti
   • Konstantinos Kepaptsoglou
   • Christina Iliopoulou

   OriginalPaper 28 November 2019 Pages: 103 - 117