| article html file updated | 7 February 2020 06:41 CET | Update | https://www.mdpi.com/1996-1073/9/4/259 |
| article html file updated | 5 May 2019 19:51 CEST | Update | N/A |
| article html file updated | 27 March 2019 00:48 CET | Update | N/A |
| article html file updated | 28 April 2016 07:52 CEST | Update | N/A |
| article html file updated | 31 March 2016 13:36 CEST | Original file | N/A |
| article xml uploaded. | 31 March 2016 13:34 CEST | Original file | https://www.mdpi.com/1996-1073/9/4/259/xml |
| article pdf uploaded. | 31 March 2016 13:34 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/259/pdf |
