| article html file updated | 7 February 2020 01:36 CET | Update | https://www.mdpi.com/2227-7382/3/4/424 |
| article html file updated | 6 May 2019 06:16 CEST | Update | N/A |
| article html file updated | 26 March 2019 15:27 CET | Update | N/A |
| article html file updated | 19 October 2016 12:15 CEST | Original file | N/A |
| article pdf uploaded. | 3 December 2015 16:39 CET | Updated version of record | https://www.mdpi.com/2227-7382/3/4/424/pdf |
| article pdf uploaded. | 1 December 2015 14:26 CET | Version of Record | https://www.mdpi.com/2227-7382/3/4/424/pdf-vor |
| article xml uploaded. | 1 December 2015 14:26 CET | Original file | https://www.mdpi.com/2227-7382/3/4/424/xml |
