| article html file updated | 6 February 2020 14:17 CET | Update | https://www.mdpi.com/2304-6732/1/4/516 |
| article html file updated | 7 May 2019 04:19 CEST | Update | - |
| article html file updated | 25 March 2019 18:56 CET | Update | - |
| article html file updated | 21 August 2015 03:43 CEST | Original file | - |
| article pdf uploaded. | 9 December 2014 07:54 CET | Updated version of record | https://www.mdpi.com/2304-6732/1/4/516/pdf |
| article pdf uploaded. | 8 December 2014 16:32 CET | Version of Record | https://www.mdpi.com/2304-6732/1/4/516/pdf-vor |
