| article html file updated | 8 February 2020 04:53 CET | Update | https://www.mdpi.com/2076-0760/6/2/44 |
| article html file updated | 24 September 2019 14:54 CEST | Update | N/A |
| article html file updated | 3 May 2019 23:49 CEST | Update | N/A |
| article html file updated | 23 May 2017 03:31 CEST | Update | N/A |
| article html file updated | 2 May 2017 13:43 CEST | Original file | N/A |
| article xml uploaded. | 2 May 2017 13:42 CEST | Original file | https://www.mdpi.com/2076-0760/6/2/44/xml |
| article pdf uploaded. | 2 May 2017 13:42 CEST | Version of Record | https://www.mdpi.com/2076-0760/6/2/44/pdf |
