| article html file updated | 6 February 2020 11:20 CET | Update | https://www.mdpi.com/2227-9717/2/3/639 |
| article html file updated | 7 May 2019 10:04 CEST | Update | N/A |
| article html file updated | 21 March 2019 22:42 CET | Update | N/A |
| article html file updated | 20 August 2015 14:51 CEST | Original file | N/A |
| article pdf uploaded. | 8 August 2014 14:51 CEST | Version of Record | https://www.mdpi.com/2227-9717/2/3/639/pdf |
