| article html file updated | 6 February 2020 08:43 CET | Update | https://www.mdpi.com/2075-5309/4/2/113 |
| article html file updated | 7 May 2019 15:38 CEST | Update | N/A |
| article html file updated | 21 March 2019 15:49 CET | Original file | N/A |
| article pdf uploaded. | 28 April 2014 11:29 CEST | Updated version of record | https://www.mdpi.com/2075-5309/4/2/113/pdf |
| article pdf uploaded. | 21 April 2014 11:55 CEST | Version of Record | https://www.mdpi.com/2075-5309/4/2/113/pdf-vor |
