| article html file updated | 7 February 2020 23:21 CET | Update | https://www.mdpi.com/2220-9964/6/2/44 |
| article html file updated | 23 September 2019 07:42 CEST | Update | N/A |
| article html file updated | 4 May 2019 11:20 CEST | Update | N/A |
| article html file updated | 1 March 2017 03:48 CET | Update | N/A |
| article html file updated | 14 February 2017 11:42 CET | Original file | N/A |
| article xml uploaded. | 14 February 2017 11:26 CET | Update | https://www.mdpi.com/2220-9964/6/2/44/xml |
| article xml uploaded. | 14 February 2017 11:26 CET | Original file | N/A |
| article pdf uploaded. | 14 February 2017 11:26 CET | Version of Record | https://www.mdpi.com/2220-9964/6/2/44/pdf |
