| article html file updated | 8 February 2020 06:39 CET | Update | https://www.mdpi.com/2076-3921/6/2/39 |
| article html file updated | 25 September 2019 00:07 CEST | Update | N/A |
| article html file updated | 3 May 2019 20:29 CEST | Update | N/A |
| article html file updated | 28 June 2017 12:30 CEST | Update | N/A |
| article html file updated | 25 May 2017 08:52 CEST | Original file | N/A |
| article xml uploaded. | 25 May 2017 08:51 CEST | Original file | https://www.mdpi.com/2076-3921/6/2/39/xml |
| article pdf uploaded. | 25 May 2017 08:51 CEST | Version of Record | https://www.mdpi.com/2076-3921/6/2/39/pdf |
