| article html file updated | 6 February 2020 00:59 CET | Update | https://www.mdpi.com/2304-8158/2/1/90 |
| article html file updated | 8 May 2019 07:23 CEST | Update | - |
| article html file updated | 20 March 2019 19:46 CET | Update | - |
| article html file updated | 10 February 2017 03:38 CET | Update | - |
| article html file updated | 17 June 2015 07:28 CEST | Original file | - |
| article pdf uploaded. | 13 March 2013 15:28 CET | Version of Record | https://www.mdpi.com/2304-8158/2/1/90/pdf |
