| article html file updated | 7 February 2020 10:35 CET | Update | https://www.mdpi.com/2221-3759/4/2/21 |
| article html file updated | 5 May 2019 12:09 CEST | Update | N/A |
| article html file updated | 27 March 2019 08:13 CET | Update | N/A |
| article html file updated | 1 July 2016 11:46 CEST | Update | N/A |
| article html file updated | 22 June 2016 11:40 CEST | Original file | N/A |
| article xml uploaded. | 22 June 2016 11:38 CEST | Original file | https://www.mdpi.com/2221-3759/4/2/21/xml |
| article pdf uploaded. | 22 June 2016 11:38 CEST | Version of Record | https://www.mdpi.com/2221-3759/4/2/21/pdf |
