| article html file updated | 6 February 2020 01:24 CET | Update | https://www.mdpi.com/2227-7102/3/2/75 |
| article html file updated | 8 May 2019 06:29 CEST | Update | N/A |
| article html file updated | 20 March 2019 20:45 CET | Update | N/A |
| article html file updated | 17 June 2015 08:14 CEST | Original file | N/A |
| article pdf uploaded. | 11 April 2013 10:55 CEST | Updated version of record | https://www.mdpi.com/2227-7102/3/2/75/pdf |
| article pdf uploaded. | 9 April 2013 10:22 CEST | Updated version of record | https://www.mdpi.com/2227-7102/3/2/75/pdf-vor |
| article pdf uploaded. | 8 April 2013 15:59 CEST | Version of Record | https://www.mdpi.com/2227-7102/3/2/75/pdf-vor |
