| article html file updated | 7 February 2020 03:49 CET | Update | https://www.mdpi.com/2226-4310/3/1/4 |
| article html file updated | 6 May 2019 01:49 CEST | Update | - |
| article html file updated | 26 March 2019 19:14 CET | Update | - |
| article html file updated | 16 June 2016 05:01 CEST | Original file | - |
| article pdf uploaded. | 25 January 2016 09:12 CET | Version of Record | https://www.mdpi.com/2226-4310/3/1/4/pdf |
| article xml uploaded. | 25 January 2016 09:12 CET | Original file | https://www.mdpi.com/2226-4310/3/1/4/xml |
