| article html file updated | 8 February 2020 02:20 CET | Update | https://www.mdpi.com/2227-7390/5/2/21 |
| article html file updated | 24 September 2019 00:45 CEST | Update | - |
| article html file updated | 4 May 2019 04:50 CEST | Update | - |
| article html file updated | 29 June 2017 11:35 CEST | Update | - |
| article html file updated | 28 March 2017 03:59 CEST | Original file | - |
| article xml uploaded. | 28 March 2017 03:08 CEST | Update | https://www.mdpi.com/2227-7390/5/2/21/xml |
| article pdf uploaded. | 28 March 2017 03:08 CEST | Version of Record | https://www.mdpi.com/2227-7390/5/2/21/pdf |
