| article html file updated | 7 February 2020 17:10 CET | Update | https://www.mdpi.com/2077-0472/6/4/57 |
| article html file updated | 5 May 2019 00:07 CEST | Update | N/A |
| article html file updated | 28 December 2016 05:20 CET | Update | N/A |
| article html file updated | 11 November 2016 02:45 CET | Update | N/A |
| article xml uploaded. | 11 November 2016 02:43 CET | Update | https://www.mdpi.com/2077-0472/6/4/57/xml |
| article pdf uploaded. | 11 November 2016 02:43 CET | Updated version of record | https://www.mdpi.com/2077-0472/6/4/57/pdf |
| article html file updated | 28 October 2016 13:18 CEST | Original file | N/A |
| article xml uploaded. | 28 October 2016 13:05 CEST | Original file | N/A |
| article pdf uploaded. | 28 October 2016 13:05 CEST | Version of Record | https://www.mdpi.com/2077-0472/6/4/57/pdf-vor |
