| article html file updated | 7 February 2020 04:13 CET | Update | https://www.mdpi.com/2077-0375/6/1/13 |
| article html file updated | 6 May 2019 01:06 CEST | Update | - |
| article html file updated | 26 March 2019 19:59 CET | Update | - |
| article html file updated | 30 March 2016 07:59 CEST | Original file | - |
| article pdf uploaded. | 3 February 2016 12:20 CET | Version of Record | https://www.mdpi.com/2077-0375/6/1/13/pdf |
| article xml uploaded. | 3 February 2016 12:20 CET | Original file | https://www.mdpi.com/2077-0375/6/1/13/xml |
