| article html file updated | 6 February 2020 19:31 CET | Update | https://www.mdpi.com/2227-9032/3/2/417 |
| article html file updated | 20 September 2019 22:35 CEST | Update | N/A |
| article html file updated | 6 May 2019 18:07 CEST | Update | N/A |
| article html file updated | 26 March 2019 04:27 CET | Update | N/A |
| article html file updated | 21 August 2015 13:22 CEST | Original file | N/A |
| article pdf uploaded. | 9 June 2015 13:37 CEST | Version of Record | https://www.mdpi.com/2227-9032/3/2/417/pdf |
