| article html file updated | 6 February 2020 19:56 CET | Update | https://www.mdpi.com/2227-9032/3/2/452 |
| article html file updated | 20 September 2019 23:09 CEST | Update | N/A |
| article html file updated | 6 May 2019 17:16 CEST | Update | N/A |
| article html file updated | 26 March 2019 05:11 CET | Update | N/A |
| article html file updated | 21 August 2015 13:58 CEST | Original file | N/A |
| article pdf uploaded. | 19 June 2015 14:57 CEST | Version of Record | https://www.mdpi.com/2227-9032/3/2/452/pdf |
