| article html file updated | 7 February 2020 04:36 CET | Update | https://www.mdpi.com/2312-7481/2/1/7 |
| article html file updated | 6 May 2019 00:15 CEST | Update | N/A |
| article html file updated | 26 March 2019 20:49 CET | Update | N/A |
| article html file updated | 8 June 2016 09:23 CEST | Original file | N/A |
| article pdf uploaded. | 16 February 2016 10:33 CET | Version of Record | https://www.mdpi.com/2312-7481/2/1/7/pdf |
| article xml uploaded. | 16 February 2016 10:33 CET | Original file | https://www.mdpi.com/2312-7481/2/1/7/xml |
