| article html file updated | 9 February 2020 00:30 CET | Update | https://www.mdpi.com/2311-5637/3/4/68 |
| article html file updated | 29 September 2019 07:42 CEST | Update | - |
| article html file updated | 2 May 2019 07:39 CEST | Update | - |
| article html file updated | 18 April 2019 05:30 CEST | Update | - |
| article html file updated | 2 January 2018 17:02 CET | Update | - |
| article html file updated | 19 December 2017 09:13 CET | Original file | - |
| article xml uploaded. | 19 December 2017 09:12 CET | Original file | https://www.mdpi.com/2311-5637/3/4/68/xml |
| article pdf uploaded. | 19 December 2017 09:12 CET | Version of Record | https://www.mdpi.com/2311-5637/3/4/68/pdf |
