| article html file updated | 6 February 2020 04:16 CET | Update | https://www.mdpi.com/2227-7072/1/3/102 |
| article html file updated | 8 May 2019 00:41 CEST | Update | N/A |
| article html file updated | 21 March 2019 04:19 CET | Update | N/A |
| article html file updated | 17 June 2015 13:03 CEST | Original file | N/A |
| article pdf uploaded. | 9 September 2013 15:38 CEST | Version of Record | https://www.mdpi.com/2227-7072/1/3/102/pdf |
