| article html file updated | 7 February 2020 04:13 CET | Update | https://www.mdpi.com/1999-4907/7/2/34 |
| article html file updated | 6 May 2019 01:06 CEST | Update | - |
| article html file updated | 26 March 2019 19:58 CET | Original file | - |
| article pdf uploaded. | 3 February 2016 09:57 CET | Version of Record | https://www.mdpi.com/1999-4907/7/2/34/pdf |
| article xml uploaded. | 3 February 2016 09:57 CET | Original file | https://www.mdpi.com/1999-4907/7/2/34/xml |
