| article html file updated | 6 February 2020 06:53 CET | Update | https://www.mdpi.com/2076-3921/3/1/38 |
| article html file updated | 7 May 2019 19:30 CEST | Update | N/A |
| article html file updated | 21 March 2019 11:23 CET | Update | N/A |
| article html file updated | 19 August 2015 18:24 CEST | Original file | N/A |
| article pdf uploaded. | 23 January 2014 15:58 CET | Updated version of record | https://www.mdpi.com/2076-3921/3/1/38/pdf |
| article pdf uploaded. | 22 January 2014 14:47 CET | Version of Record | https://www.mdpi.com/2076-3921/3/1/38/pdf-vor |
