| article html file updated | 6 February 2020 23:54 CET | Update | https://www.mdpi.com/2227-9032/3/4/987 |
| article html file updated | 21 September 2019 04:57 CEST | Update | N/A |
| article html file updated | 6 May 2019 09:05 CEST | Update | N/A |
| article html file updated | 26 March 2019 12:47 CET | Update | N/A |
| article html file updated | 18 May 2016 05:50 CEST | Original file | N/A |
| article pdf uploaded. | 19 October 2015 11:32 CEST | Updated version of record | https://www.mdpi.com/2227-9032/3/4/987/pdf |
| article pdf uploaded. | 16 October 2015 15:57 CEST | Version of Record | https://www.mdpi.com/2227-9032/3/4/987/pdf-vor |
