| article html file updated | 7 February 2020 19:17 CET | Update | https://www.mdpi.com/2297-8739/3/4/33 |
| article html file updated | 22 September 2019 09:36 CEST | Update | N/A |
| article html file updated | 4 May 2019 19:57 CEST | Update | N/A |
| article html file updated | 28 December 2016 08:27 CET | Update | N/A |
| article html file updated | 8 December 2016 12:12 CET | Original file | N/A |
| article xml uploaded. | 8 December 2016 12:11 CET | Original file | https://www.mdpi.com/2297-8739/3/4/33/xml |
| article pdf uploaded. | 8 December 2016 12:11 CET | Version of Record | https://www.mdpi.com/2297-8739/3/4/33/pdf |
