| article html file updated | 6 February 2020 08:37 CET | Update | https://www.mdpi.com/2076-3921/3/2/278 |
| article html file updated | 7 May 2019 15:50 CEST | Update | N/A |
| article html file updated | 21 March 2019 15:34 CET | Update | N/A |
| article html file updated | 20 August 2015 03:22 CEST | Original file | N/A |
| article pdf uploaded. | 15 April 2014 18:24 CEST | Updated version of record | https://www.mdpi.com/2076-3921/3/2/278/pdf |
