| article html file updated | 7 February 2020 03:54 CET | Update | https://www.mdpi.com/2079-9276/5/1/6 |
| article html file updated | 6 May 2019 01:41 CEST | Update | - |
| article html file updated | 26 March 2019 19:24 CET | Update | - |
| article html file updated | 8 June 2016 06:40 CEST | Original file | - |
| article pdf uploaded. | 26 January 2016 11:32 CET | Version of Record | https://www.mdpi.com/2079-9276/5/1/6/pdf |
| article xml uploaded. | 26 January 2016 11:32 CET | Original file | https://www.mdpi.com/2079-9276/5/1/6/xml |
