| article html file updated | 7 February 2020 23:56 CET | Update | https://www.mdpi.com/1999-4907/8/2/50 |
| article html file updated | 23 September 2019 11:01 CEST | Update | - |
| article html file updated | 4 May 2019 10:09 CEST | Update | - |
| article html file updated | 28 February 2017 10:59 CET | Update | - |
| article html file updated | 22 February 2017 06:39 CET | Original file | - |
| article xml uploaded. | 22 February 2017 06:38 CET | Original file | https://www.mdpi.com/1999-4907/8/2/50/xml |
| article pdf uploaded. | 22 February 2017 06:38 CET | Updated version of record | https://www.mdpi.com/1999-4907/8/2/50/pdf |
| article pdf uploaded. | 21 February 2017 15:49 CET | Version of Record | https://www.mdpi.com/1999-4907/8/2/50/pdf-vor |
