| article html file updated | 7 February 2020 08:16 CET | Update | https://www.mdpi.com/2311-5521/1/2/6 |
| article html file updated | 5 May 2019 16:38 CEST | Update | N/A |
| article html file updated | 27 March 2019 03:54 CET | Update | N/A |
| article html file updated | 27 October 2017 10:20 CEST | Update | N/A |
| article html file updated | 6 May 2016 12:12 CEST | Original file | N/A |
| article xml uploaded. | 6 May 2016 12:11 CEST | Original file | https://www.mdpi.com/2311-5521/1/2/6/xml |
| article pdf uploaded. | 6 May 2016 12:11 CEST | Version of Record | https://www.mdpi.com/2311-5521/1/2/6/pdf |
