| article html file updated | 7 February 2020 22:06 CET | Update | https://www.mdpi.com/2220-9964/6/2/33 |
| article html file updated | 23 September 2019 00:53 CEST | Update | N/A |
| article html file updated | 4 May 2019 13:50 CEST | Update | N/A |
| article html file updated | 1 March 2017 03:40 CET | Update | N/A |
| article html file updated | 24 January 2017 08:35 CET | Original file | N/A |
| article xml uploaded. | 24 January 2017 08:33 CET | Original file | https://www.mdpi.com/2220-9964/6/2/33/xml |
| article pdf uploaded. | 24 January 2017 08:33 CET | Version of Record | https://www.mdpi.com/2220-9964/6/2/33/pdf |
