| article html file updated | 6 February 2020 07:31 CET | Update | https://www.mdpi.com/2226-4787/2/1/86 |
| article html file updated | 7 May 2019 18:07 CEST | Update | N/A |
| article html file updated | 21 March 2019 12:58 CET | Update | N/A |
| article html file updated | 31 March 2017 06:01 CEST | Original file | N/A |
| article pdf uploaded. | 26 February 2014 09:31 CET | Updated version of record | https://www.mdpi.com/2226-4787/2/1/86/pdf |
| article pdf uploaded. | 26 February 2014 09:22 CET | Version of Record | N/A |
