| article html file updated | 6 February 2020 21:08 CET | Update | https://www.mdpi.com/2227-9075/2/3/472 |
| article html file updated | 6 May 2019 14:49 CEST | Update | N/A |
| article html file updated | 26 March 2019 07:33 CET | Update | N/A |
| article html file updated | 21 August 2015 15:16 CEST | Original file | N/A |
| article pdf uploaded. | 28 July 2015 12:19 CEST | Version of Record | https://www.mdpi.com/2227-9075/2/3/472/pdf |
