| article html file updated | 8 February 2020 07:04 CET | Update | https://www.mdpi.com/2221-3759/5/2/6 |
| article html file updated | 25 September 2019 02:12 CEST | Update | N/A |
| article html file updated | 3 May 2019 19:45 CEST | Update | N/A |
| article html file updated | 29 June 2017 11:32 CEST | Update | N/A |
| article html file updated | 31 May 2017 10:50 CEST | Original file | N/A |
| article xml uploaded. | 31 May 2017 10:26 CEST | Original file | https://www.mdpi.com/2221-3759/5/2/6/xml |
| article pdf uploaded. | 31 May 2017 10:26 CEST | Version of Record | https://www.mdpi.com/2221-3759/5/2/6/pdf |
