| article html file updated | 8 February 2020 18:27 CET | Update | https://www.mdpi.com/2226-471X/2/4/21 |
| article html file updated | 2 May 2019 21:18 CEST | Update | N/A |
| article html file updated | 27 November 2017 16:26 CET | Update | N/A |
| article xml uploaded. | 27 November 2017 16:25 CET | Update | https://www.mdpi.com/2226-471X/2/4/21/xml |
| article pdf uploaded. | 27 November 2017 16:25 CET | Updated version of record | https://www.mdpi.com/2226-471X/2/4/21/pdf |
| article pdf uploaded. | 27 November 2017 16:25 CET | Updated version of record | https://www.mdpi.com/2226-471X/2/4/21/pdf-vor |
| article html file updated | 14 October 2017 22:50 CEST | Original file | N/A |
| article xml uploaded. | 13 October 2017 16:29 CEST | Original file | N/A |
| article pdf uploaded. | 13 October 2017 16:29 CEST | Version of Record | https://www.mdpi.com/2226-471X/2/4/21/pdf-vor |
