| article html file updated | 12 February 2020 20:17 CET | Update | https://www.mdpi.com/2226-471X/4/2/39 |
| article html file updated | 22 October 2019 01:10 CEST | Update | N/A |
| article html file updated | 21 June 2019 08:13 CEST | Original file | N/A |
| article pdf uploaded. | 21 June 2019 08:11 CEST | Updated version of record | https://www.mdpi.com/2226-471X/4/2/39/pdf |
| article xml uploaded. | 21 June 2019 08:11 CEST | Update | https://www.mdpi.com/2226-471X/4/2/39/xml |
| article xml file uploaded | 21 June 2019 08:11 CEST | Update | N/A |
| article pdf uploaded. | 17 June 2019 16:07 CEST | Version of Record | https://www.mdpi.com/2226-471X/4/2/39/pdf-vor |
| article xml file uploaded | 17 June 2019 16:07 CEST | Original file | N/A |
