| article html file updated | 8 February 2020 03:25 CET | Update | https://www.mdpi.com/1996-1073/10/4/521 |
| article html file updated | 24 September 2019 06:46 CEST | Update | N/A |
| article html file updated | 4 May 2019 02:32 CEST | Update | N/A |
| article html file updated | 28 April 2017 06:16 CEST | Update | N/A |
| article html file updated | 13 April 2017 09:38 CEST | Original file | N/A |
| article xml uploaded. | 13 April 2017 09:36 CEST | Original file | https://www.mdpi.com/1996-1073/10/4/521/xml |
| article pdf uploaded. | 13 April 2017 09:36 CEST | Updated version of record | https://www.mdpi.com/1996-1073/10/4/521/pdf |
| article pdf uploaded. | 12 April 2017 12:00 CEST | Version of Record | https://www.mdpi.com/1996-1073/10/4/521/pdf-vor |
