| article html file updated | 8 February 2020 08:22 CET | Update | https://www.mdpi.com/2227-7099/5/2/21 |
| article html file updated | 25 September 2019 08:54 CEST | Update | N/A |
| article html file updated | 3 May 2019 17:18 CEST | Update | N/A |
| article html file updated | 29 June 2017 11:23 CEST | Update | N/A |
| article html file updated | 15 June 2017 12:34 CEST | Original file | N/A |
| article xml uploaded. | 15 June 2017 12:33 CEST | Original file | https://www.mdpi.com/2227-7099/5/2/21/xml |
| article pdf uploaded. | 15 June 2017 12:33 CEST | Version of Record | https://www.mdpi.com/2227-7099/5/2/21/pdf |
