| article html file updated | 7 February 2020 23:36 CET | Update | https://www.mdpi.com/2079-6412/7/2/31 |
| article html file updated | 23 September 2019 09:06 CEST | Update | - |
| article html file updated | 4 May 2019 10:51 CEST | Update | - |
| article html file updated | 2 March 2017 03:39 CET | Update | - |
| article html file updated | 17 February 2017 03:58 CET | Original file | - |
| article xml uploaded. | 17 February 2017 03:57 CET | Original file | https://www.mdpi.com/2079-6412/7/2/31/xml |
| article pdf uploaded. | 17 February 2017 03:57 CET | Version of Record | https://www.mdpi.com/2079-6412/7/2/31/pdf |
