| article html file updated | 7 February 2020 23:14 CET | Update | https://www.mdpi.com/2077-0383/6/2/20 |
| article html file updated | 23 September 2019 07:06 CEST | Update | - |
| article html file updated | 4 May 2019 11:33 CEST | Update | - |
| article html file updated | 2 March 2017 09:47 CET | Update | - |
| article html file updated | 13 February 2017 12:52 CET | Original file | - |
| article xml uploaded. | 13 February 2017 12:51 CET | Original file | https://www.mdpi.com/2077-0383/6/2/20/xml |
| article pdf uploaded. | 13 February 2017 12:50 CET | Version of Record | https://www.mdpi.com/2077-0383/6/2/20/pdf |
