| article html file updated | 6 February 2020 01:19 CET | Update | https://www.mdpi.com/2220-9964/2/2/276 |
| article html file updated | 8 May 2019 06:42 CEST | Update | N/A |
| article html file updated | 20 March 2019 20:31 CET | Update | N/A |
| article html file updated | 17 June 2015 08:08 CEST | Original file | N/A |
| article pdf uploaded. | 18 April 2013 15:09 CEST | Updated version of record | https://www.mdpi.com/2220-9964/2/2/276/pdf |
| article pdf uploaded. | 9 April 2013 16:08 CEST | Updated version of record | https://www.mdpi.com/2220-9964/2/2/276/pdf-vor |
| article pdf uploaded. | 2 April 2013 13:51 CEST | Version of Record | https://www.mdpi.com/2220-9964/2/2/276/pdf-vor |
