| article html file updated | 6 February 2020 18:23 CET | Update | https://www.mdpi.com/2076-3921/4/2/345 |
| article html file updated | 6 May 2019 20:33 CEST | Update | N/A |
| article html file updated | 26 March 2019 02:04 CET | Update | N/A |
| article html file updated | 21 August 2015 11:42 CEST | Original file | N/A |
| article pdf uploaded. | 8 May 2015 09:31 CEST | Updated version of record | https://www.mdpi.com/2076-3921/4/2/345/pdf |
| article pdf uploaded. | 6 May 2015 14:03 CEST | Version of Record | https://www.mdpi.com/2076-3921/4/2/345/pdf-vor |
