| article html file updated | 7 February 2020 23:57 CET | Update | https://www.mdpi.com/1660-3397/15/2/51 |
| article html file updated | 23 September 2019 11:06 CEST | Update | - |
| article html file updated | 4 May 2019 10:07 CEST | Update | - |
| article html file updated | 2 March 2017 09:40 CET | Update | - |
| article html file updated | 22 February 2017 07:46 CET | Original file | - |
| article xml uploaded. | 22 February 2017 07:45 CET | Original file | https://www.mdpi.com/1660-3397/15/2/51/xml |
| article pdf uploaded. | 22 February 2017 07:45 CET | Version of Record | https://www.mdpi.com/1660-3397/15/2/51/pdf |
