| article html file updated | 6 February 2020 03:55 CET | Update | https://www.mdpi.com/2073-4336/4/3/457 |
| article html file updated | 8 May 2019 01:24 CEST | Update | - |
| article html file updated | 21 March 2019 03:24 CET | Update | - |
| article html file updated | 1 August 2017 04:55 CEST | Original file | - |
| article xml uploaded. | 1 August 2017 04:53 CEST | Original file | https://www.mdpi.com/2073-4336/4/3/457/xml |
| article pdf uploaded. | 23 August 2013 09:43 CEST | Updated version of record | https://www.mdpi.com/2073-4336/4/3/457/pdf |
| article pdf uploaded. | 21 August 2013 15:34 CEST | Version of Record | https://www.mdpi.com/2073-4336/4/3/457/pdf-vor |
