| article html file updated | 7 February 2020 14:28 CET | Update | https://www.mdpi.com/2077-0375/6/3/42 |
| article html file updated | 5 May 2019 05:02 CEST | Update | - |
| article html file updated | 29 September 2016 09:57 CEST | Update | - |
| article html file updated | 6 September 2016 04:51 CEST | Original file | - |
| article xml uploaded. | 6 September 2016 04:50 CEST | Original file | https://www.mdpi.com/2077-0375/6/3/42/xml |
| article pdf uploaded. | 6 September 2016 04:50 CEST | Version of Record | https://www.mdpi.com/2077-0375/6/3/42/pdf |
