| article html file updated | 8 February 2020 23:20 CET | Update | https://www.mdpi.com/2309-608X/3/4/68 |
| article html file updated | 2 May 2019 10:14 CEST | Update | N/A |
| article html file updated | 18 April 2019 07:52 CEST | Update | N/A |
| article html file updated | 11 December 2018 09:00 CET | Update | N/A |
| article html file updated | 6 December 2017 12:48 CET | Original file | N/A |
| article xml uploaded. | 6 December 2017 12:47 CET | Original file | https://www.mdpi.com/2309-608X/3/4/68/xml |
| article pdf uploaded. | 6 December 2017 12:47 CET | Version of Record | https://www.mdpi.com/2309-608X/3/4/68/pdf |
