| article html file updated | 6 February 2020 01:30 CET | Update | https://www.mdpi.com/2227-7102/3/2/121 |
| article html file updated | 19 September 2019 19:37 CEST | Update | N/A |
| article html file updated | 8 May 2019 06:18 CEST | Update | N/A |
| article html file updated | 20 March 2019 20:59 CET | Update | N/A |
| article html file updated | 17 June 2015 08:24 CEST | Original file | N/A |
| article pdf uploaded. | 12 April 2013 14:16 CEST | Version of Record | https://www.mdpi.com/2227-7102/3/2/121/pdf |
