| article html file updated | 7 February 2020 21:06 CET | Update | https://www.mdpi.com/2079-9276/6/1/2 |
| article html file updated | 4 May 2019 16:06 CEST | Update | - |
| article html file updated | 30 March 2017 08:55 CEST | Update | - |
| article html file updated | 10 January 2017 11:15 CET | Original file | - |
| article xml uploaded. | 10 January 2017 11:14 CET | Original file | https://www.mdpi.com/2079-9276/6/1/2/xml |
| article pdf uploaded. | 10 January 2017 11:14 CET | Version of Record | https://www.mdpi.com/2079-9276/6/1/2/pdf |
