| article html file updated | 8 February 2020 02:25 CET | Update | https://www.mdpi.com/2073-8994/9/4/51 |
| article html file updated | 24 September 2019 01:11 CEST | Update | - |
| article html file updated | 4 May 2019 04:40 CEST | Update | - |
| article html file updated | 28 April 2017 07:15 CEST | Update | - |
| article html file updated | 30 March 2017 02:29 CEST | Original file | - |
| article xml uploaded. | 30 March 2017 02:28 CEST | Original file | https://www.mdpi.com/2073-8994/9/4/51/xml |
| article pdf uploaded. | 30 March 2017 02:28 CEST | Updated version of record | https://www.mdpi.com/2073-8994/9/4/51/pdf |
| article pdf uploaded. | 28 March 2017 15:55 CEST | Version of Record | https://www.mdpi.com/2073-8994/9/4/51/pdf-vor |
