| article html file updated | 7 February 2020 06:15 CET | Update | https://www.mdpi.com/2220-9964/5/4/40 |
| article html file updated | 5 May 2019 20:43 CEST | Update | N/A |
| article html file updated | 27 March 2019 00:04 CET | Update | N/A |
| article html file updated | 27 April 2016 10:17 CEST | Original file | N/A |
| article xml uploaded. | 23 March 2016 09:36 CET | Original file | https://www.mdpi.com/2220-9964/5/4/40/xml |
| article pdf uploaded. | 23 March 2016 09:36 CET | Version of Record | https://www.mdpi.com/2220-9964/5/4/40/pdf |
