| article html file updated | 6 February 2020 22:06 CET | Update | https://www.mdpi.com/2077-0383/4/9/1668 |
| article html file updated | 6 May 2019 12:47 CEST | Update | N/A |
| article html file updated | 26 March 2019 09:24 CET | Update | N/A |
| article html file updated | 10 October 2015 06:31 CEST | Original file | N/A |
| article xml file uploaded | 10 October 2015 06:31 CEST | Original file | https://www.mdpi.com/2077-0383/4/9/1668/xml |
| article pdf uploaded. | 25 August 2015 13:29 CEST | Version of Record | https://www.mdpi.com/2077-0383/4/9/1668/pdf |
