| article html file updated | 7 February 2020 16:08 CET | Update | https://www.mdpi.com/2077-0472/6/4/52 |
| article html file updated | 5 May 2019 02:04 CEST | Update | - |
| article html file updated | 28 December 2016 05:14 CET | Update | - |
| article html file updated | 10 October 2016 14:13 CEST | Original file | - |
| article xml uploaded. | 10 October 2016 14:11 CEST | Update | https://www.mdpi.com/2077-0472/6/4/52/xml |
| article xml uploaded. | 10 October 2016 14:11 CEST | Original file | - |
| article pdf uploaded. | 10 October 2016 14:11 CEST | Version of Record | https://www.mdpi.com/2077-0472/6/4/52/pdf |
