| article html file updated | 9 February 2020 01:25 CET | Update | https://www.mdpi.com/2079-9721/6/1/4 |
| article html file updated | 29 September 2019 12:56 CEST | Update | N/A |
| article html file updated | 2 May 2019 05:40 CEST | Update | N/A |
| article html file updated | 18 April 2019 03:41 CEST | Update | N/A |
| article html file updated | 28 March 2019 11:42 CET | Update | N/A |
| article html file updated | 27 March 2018 14:43 CEST | Update | N/A |
| article html file updated | 28 December 2017 12:33 CET | Original file | N/A |
| article xml uploaded. | 28 December 2017 12:31 CET | Original file | https://www.mdpi.com/2079-9721/6/1/4/xml |
| article pdf uploaded. | 28 December 2017 12:31 CET | Version of Record | https://www.mdpi.com/2079-9721/6/1/4/pdf |
