| article html file updated | 9 February 2020 06:52 CET | Update | https://www.mdpi.com/2073-4395/8/2/21 |
| article html file updated | 1 May 2019 17:57 CEST | Update | - |
| article html file updated | 17 April 2019 17:17 CEST | Update | - |
| article html file updated | 28 March 2019 23:48 CET | Update | - |
| article html file updated | 14 March 2018 14:51 CET | Update | - |
| article html file updated | 23 February 2018 07:47 CET | Original file | - |
| article xml uploaded. | 23 February 2018 07:45 CET | Update | https://www.mdpi.com/2073-4395/8/2/21/xml |
| article xml uploaded. | 23 February 2018 07:45 CET | Original file | - |
| article pdf uploaded. | 23 February 2018 07:45 CET | Updated version of record | https://www.mdpi.com/2073-4395/8/2/21/pdf |
| article pdf uploaded. | 16 February 2018 09:28 CET | Version of Record | https://www.mdpi.com/2073-4395/8/2/21/pdf-vor |
