| article html file updated | 7 February 2020 01:54 CET | Update | https://www.mdpi.com/2077-0375/5/4/903 |
| article html file updated | 6 May 2019 05:39 CEST | Update | - |
| article html file updated | 26 March 2019 15:57 CET | Original file | - |
| article pdf uploaded. | 8 December 2015 09:13 CET | Version of Record | https://www.mdpi.com/2077-0375/5/4/903/pdf |
| article xml uploaded. | 8 December 2015 09:13 CET | Original file | https://www.mdpi.com/2077-0375/5/4/903/xml |
