| article html file updated | 30 August 2025 01:53 CEST | Update | https://www.mdpi.com/2079-9276/6/4/68 |
| article html file updated | 16 July 2022 07:46 CEST | Update | N/A |
| article html file updated | 8 February 2020 23:05 CET | Update | N/A |
| article html file updated | 28 September 2019 23:32 CEST | Update | N/A |
| article html file updated | 2 May 2019 10:46 CEST | Update | N/A |
| article html file updated | 18 April 2019 08:23 CEST | Update | N/A |
| article html file updated | 2 January 2018 10:28 CET | Update | N/A |
| article html file updated | 4 December 2017 15:21 CET | Original file | N/A |
| article xml uploaded. | 4 December 2017 15:20 CET | Update | https://www.mdpi.com/2079-9276/6/4/68/xml |
| article xml uploaded. | 4 December 2017 15:20 CET | Original file | N/A |
| article pdf uploaded. | 4 December 2017 15:20 CET | Version of Record | https://www.mdpi.com/2079-9276/6/4/68/pdf |
