| article html file updated | 7 February 2020 21:19 CET | Update | https://www.mdpi.com/2312-7481/3/1/4 |
| article html file updated | 4 May 2019 15:39 CEST | Update | N/A |
| article html file updated | 29 March 2017 08:49 CEST | Update | N/A |
| article html file updated | 12 January 2017 10:01 CET | Original file | N/A |
| article xml uploaded. | 12 January 2017 09:59 CET | Original file | https://www.mdpi.com/2312-7481/3/1/4/xml |
| article pdf uploaded. | 12 January 2017 09:59 CET | Version of Record | https://www.mdpi.com/2312-7481/3/1/4/pdf |
