| article html file updated | 9 February 2020 00:59 CET | Update | https://www.mdpi.com/2226-471X/2/4/31 |
| article html file updated | 29 September 2019 10:30 CEST | Update | - |
| article html file updated | 2 May 2019 06:36 CEST | Update | - |
| article html file updated | 18 April 2019 04:32 CEST | Update | - |
| article html file updated | 28 March 2019 10:37 CET | Update | - |
| article html file updated | 24 December 2017 14:18 CET | Original file | - |
| article xml uploaded. | 24 December 2017 14:16 CET | Original file | https://www.mdpi.com/2226-471X/2/4/31/xml |
| article pdf uploaded. | 24 December 2017 14:16 CET | Updated version of record | https://www.mdpi.com/2226-471X/2/4/31/pdf |
| article pdf uploaded. | 22 December 2017 17:57 CET | Version of Record | https://www.mdpi.com/2226-471X/2/4/31/pdf-vor |
