| article html file updated | 8 February 2020 07:18 CET | Update | https://www.mdpi.com/2297-8739/4/2/21 |
| article html file updated | 25 September 2019 03:19 CEST | Update | - |
| article html file updated | 3 May 2019 19:19 CEST | Update | - |
| article html file updated | 30 June 2017 09:14 CEST | Original file | - |
| article xml uploaded. | 2 June 2017 13:40 CEST | Original file | https://www.mdpi.com/2297-8739/4/2/21/xml |
| article pdf uploaded. | 2 June 2017 13:40 CEST | Version of Record | https://www.mdpi.com/2297-8739/4/2/21/pdf |
