| article html file updated | 8 February 2020 02:38 CET | Update | https://www.mdpi.com/2072-6694/9/4/31 |
| article html file updated | 4 May 2019 04:11 CEST | Update | - |
| article html file updated | 28 April 2017 05:34 CEST | Update | - |
| article html file updated | 10 April 2017 10:24 CEST | Original file | - |
| article xml uploaded. | 10 April 2017 10:23 CEST | Update | https://www.mdpi.com/2072-6694/9/4/31/xml |
| article pdf uploaded. | 10 April 2017 10:23 CEST | Updated version of record | https://www.mdpi.com/2072-6694/9/4/31/pdf |
| article pdf uploaded. | 31 March 2017 16:18 CEST | Version of Record | https://www.mdpi.com/2072-6694/9/4/31/pdf-vor |
