| article html file updated | 8 February 2020 02:51 CET | Update | https://www.mdpi.com/2077-0383/6/4/42 |
| article html file updated | 24 September 2019 03:46 CEST | Update | - |
| article html file updated | 4 May 2019 03:41 CEST | Update | - |
| article html file updated | 28 April 2017 06:48 CEST | Update | - |
| article html file updated | 4 April 2017 12:29 CEST | Original file | - |
| article xml uploaded. | 4 April 2017 12:28 CEST | Original file | https://www.mdpi.com/2077-0383/6/4/42/xml |
| article pdf uploaded. | 4 April 2017 12:28 CEST | Version of Record | https://www.mdpi.com/2077-0383/6/4/42/pdf |
