| article html file updated | 6 February 2020 21:56 CET | Update | https://www.mdpi.com/2227-9032/3/3/726 |
| article html file updated | 21 September 2019 02:09 CEST | Update | N/A |
| article html file updated | 6 May 2019 13:08 CEST | Update | N/A |
| article html file updated | 26 March 2019 09:05 CET | Original file | N/A |
| article pdf uploaded. | 20 August 2015 11:44 CEST | Version of Record | https://www.mdpi.com/2227-9032/3/3/726/pdf |
