| article html file updated | 8 February 2020 14:08 CET | Update | https://www.mdpi.com/2076-3921/6/3/68 |
| article html file updated | 26 September 2019 16:22 CEST | Update | - |
| article html file updated | 3 May 2019 05:47 CEST | Update | - |
| article html file updated | 30 September 2017 11:19 CEST | Update | - |
| article html file updated | 23 August 2017 06:21 CEST | Original file | - |
| article xml uploaded. | 23 August 2017 06:20 CEST | Original file | https://www.mdpi.com/2076-3921/6/3/68/xml |
| article pdf uploaded. | 23 August 2017 06:20 CEST | Updated version of record | https://www.mdpi.com/2076-3921/6/3/68/pdf |
| article pdf uploaded. | 22 August 2017 12:54 CEST | Version of Record | https://www.mdpi.com/2076-3921/6/3/68/pdf-vor |
