| article html file updated | 6 February 2020 08:59 CET | Update | https://www.mdpi.com/2077-0472/4/2/132 |
| article html file updated | 21 March 2019 16:25 CET | Update | - |
| article html file updated | 20 August 2015 05:22 CEST | Original file | - |
| article pdf uploaded. | 7 May 2014 15:04 CEST | Updated version of record | https://www.mdpi.com/2077-0472/4/2/132/pdf |
| article pdf uploaded. | 30 April 2014 18:08 CEST | Version of Record | https://www.mdpi.com/2077-0472/4/2/132/pdf-vor |
