| article html file updated | 6 February 2020 02:50 CET | Update | https://www.mdpi.com/2304-6775/1/2/49 |
| article html file updated | 19 September 2019 22:08 CEST | Update | N/A |
| article html file updated | 8 May 2019 03:35 CEST | Update | N/A |
| article html file updated | 21 March 2019 00:22 CET | Update | N/A |
| article html file updated | 17 June 2015 10:36 CEST | Original file | N/A |
| article pdf uploaded. | 26 June 2013 12:14 CEST | Version of Record | https://www.mdpi.com/2304-6775/1/2/49/pdf |
