| article html file updated | 7 February 2020 04:21 CET | Update | https://www.mdpi.com/1999-4907/7/2/38 |
| article html file updated | 6 May 2019 00:49 CEST | Update | N/A |
| article html file updated | 26 March 2019 20:17 CET | Original file | N/A |
| article pdf uploaded. | 5 February 2016 12:21 CET | Version of Record | https://www.mdpi.com/1999-4907/7/2/38/pdf |
| article xml uploaded. | 5 February 2016 12:21 CET | Original file | https://www.mdpi.com/1999-4907/7/2/38/xml |
