| article html file updated | 7 February 2020 21:12 CET | Update | https://www.mdpi.com/2227-9709/4/1/2 |
| article html file updated | 4 May 2019 15:54 CEST | Update | - |
| article html file updated | 27 October 2017 10:24 CEST | Update | - |
| article html file updated | 11 January 2017 11:16 CET | Original file | - |
| article xml uploaded. | 11 January 2017 11:15 CET | Original file | https://www.mdpi.com/2227-9709/4/1/2/xml |
| article pdf uploaded. | 11 January 2017 11:14 CET | Version of Record | https://www.mdpi.com/2227-9709/4/1/2/pdf |
