| article html file updated | 6 February 2020 22:16 CET | Update | https://www.mdpi.com/2218-6581/4/3/316 |
| article html file updated | 6 May 2019 12:27 CEST | Update | N/A |
| article html file updated | 26 March 2019 09:43 CET | Original file | N/A |
| article pdf uploaded. | 31 August 2015 08:50 CEST | Updated version of record | https://www.mdpi.com/2218-6581/4/3/316/pdf |
| article pdf uploaded. | 28 August 2015 15:50 CEST | Version of Record | https://www.mdpi.com/2218-6581/4/3/316/pdf-vor |
