| article html file updated | 7 February 2020 04:16 CET | Update | https://www.mdpi.com/2079-9268/6/1/3 |
| article html file updated | 6 May 2019 00:59 CEST | Update | - |
| article html file updated | 26 March 2019 20:06 CET | Original file | - |
| article pdf uploaded. | 4 February 2016 12:20 CET | Version of Record | https://www.mdpi.com/2079-9268/6/1/3/pdf |
| article xml uploaded. | 4 February 2016 12:20 CET | Original file | https://www.mdpi.com/2079-9268/6/1/3/xml |
