| article html file updated | 7 February 2020 20:32 CET | Update | https://www.mdpi.com/2311-7524/3/1/21 |
| article html file updated | 22 September 2019 16:27 CEST | Update | N/A |
| article html file updated | 4 May 2019 17:21 CEST | Update | N/A |
| article html file updated | 30 December 2016 05:11 CET | Original file | N/A |
| article xml uploaded. | 30 December 2016 05:10 CET | Original file | https://www.mdpi.com/2311-7524/3/1/21/xml |
| article pdf uploaded. | 30 December 2016 05:10 CET | Version of Record | https://www.mdpi.com/2311-7524/3/1/21/pdf |
