| article html file updated | 7 February 2020 23:54 CET | Update | https://www.mdpi.com/2220-9964/6/2/56 |
| article html file updated | 23 September 2019 10:44 CEST | Update | N/A |
| article html file updated | 4 May 2019 10:15 CEST | Update | N/A |
| article html file updated | 1 March 2017 03:56 CET | Update | N/A |
| article html file updated | 21 February 2017 12:45 CET | Original file | N/A |
| article xml uploaded. | 21 February 2017 12:43 CET | Update | https://www.mdpi.com/2220-9964/6/2/56/xml |
| article xml uploaded. | 21 February 2017 12:43 CET | Original file | N/A |
| article pdf uploaded. | 21 February 2017 12:43 CET | Version of Record | https://www.mdpi.com/2220-9964/6/2/56/pdf |
