| article html file updated | 7 February 2020 20:48 CET | Update | https://www.mdpi.com/2220-9964/6/1/6 |
| article html file updated | 22 September 2019 18:02 CEST | Update | N/A |
| article html file updated | 4 May 2019 16:44 CEST | Update | N/A |
| article html file updated | 8 February 2017 08:44 CET | Update | N/A |
| article html file updated | 10 January 2017 03:17 CET | Update | N/A |
| article xml uploaded. | 10 January 2017 03:16 CET | Update | https://www.mdpi.com/2220-9964/6/1/6/xml |
| article pdf uploaded. | 10 January 2017 03:16 CET | Updated version of record | https://www.mdpi.com/2220-9964/6/1/6/pdf |
| article html file updated | 5 January 2017 08:35 CET | Original file | N/A |
| article pdf uploaded. | 5 January 2017 08:34 CET | Version of Record | https://www.mdpi.com/2220-9964/6/1/6/pdf-vor |
