| article html file updated | 6 February 2020 03:14 CET | Update | https://www.mdpi.com/2227-7382/1/2/70 |
| article html file updated | 8 May 2019 02:51 CEST | Update | N/A |
| article html file updated | 21 March 2019 01:20 CET | Update | N/A |
| article html file updated | 16 February 2017 06:55 CET | Update | N/A |
| article html file updated | 17 June 2015 11:23 CEST | Original file | N/A |
| article pdf uploaded. | 17 July 2013 08:36 CEST | Updated version of record | https://www.mdpi.com/2227-7382/1/2/70/pdf |
| article pdf uploaded. | 16 July 2013 12:18 CEST | Version of Record | https://www.mdpi.com/2227-7382/1/2/70/pdf-vor |
