| article html file updated | 6 February 2020 09:04 CET | Update | https://www.mdpi.com/2076-3921/3/2/339 |
| article html file updated | 7 May 2019 14:54 CEST | Update | N/A |
| article html file updated | 21 March 2019 16:39 CET | Update | N/A |
| article html file updated | 20 August 2015 05:58 CEST | Original file | N/A |
| article pdf uploaded. | 8 May 2014 11:01 CEST | Updated version of record | https://www.mdpi.com/2076-3921/3/2/339/pdf |
| article pdf uploaded. | 6 May 2014 16:24 CEST | Version of Record | https://www.mdpi.com/2076-3921/3/2/339/pdf-vor |
