| article html file updated | 7 February 2020 22:51 CET | Update | https://www.mdpi.com/2073-4344/7/2/51 |
| article html file updated | 23 September 2019 04:59 CEST | Update | - |
| article html file updated | 4 May 2019 12:20 CEST | Update | - |
| article html file updated | 1 March 2017 07:50 CET | Update | - |
| article html file updated | 8 February 2017 11:21 CET | Original file | - |
| article xml uploaded. | 8 February 2017 10:50 CET | Update | https://www.mdpi.com/2073-4344/7/2/51/xml |
| article xml uploaded. | 8 February 2017 10:50 CET | Original file | - |
| article pdf uploaded. | 8 February 2017 10:50 CET | Version of Record | https://www.mdpi.com/2073-4344/7/2/51/pdf |
