| article html file updated | 7 February 2020 07:40 CET | Update | https://www.mdpi.com/2223-7747/5/2/21 |
| article html file updated | 5 May 2019 17:50 CEST | Update | N/A |
| article html file updated | 27 March 2019 02:42 CET | Update | N/A |
| article html file updated | 4 July 2016 11:46 CEST | Update | N/A |
| article html file updated | 22 April 2016 16:26 CEST | Original file | N/A |
| article xml uploaded. | 22 April 2016 16:24 CEST | Original file | https://www.mdpi.com/2223-7747/5/2/21/xml |
| article pdf uploaded. | 22 April 2016 16:24 CEST | Version of Record | https://www.mdpi.com/2223-7747/5/2/21/pdf |
