| article html file updated | 8 February 2020 12:47 CET | Update | https://www.mdpi.com/2227-9067/4/8/68 |
| article html file updated | 3 May 2019 08:28 CEST | Update | N/A |
| article html file updated | 27 March 2019 19:15 CET | Update | N/A |
| article html file updated | 1 September 2017 08:26 CEST | Update | N/A |
| article html file updated | 6 August 2017 04:06 CEST | Original file | N/A |
| article xml uploaded. | 6 August 2017 04:05 CEST | Original file | https://www.mdpi.com/2227-9067/4/8/68/xml |
| article pdf uploaded. | 6 August 2017 04:05 CEST | Updated version of record | https://www.mdpi.com/2227-9067/4/8/68/pdf |
| article pdf uploaded. | 4 August 2017 11:11 CEST | Version of Record | https://www.mdpi.com/2227-9067/4/8/68/pdf-vor |
