| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Optica Publishing Group | https://opg.optica.org/abstract.cfm?URI=ol-43-24-6033 | |
| Full text from | free resource | Linkoping University Electronic Press | http://liu.diva-portal.org/smash/get/diva2:1276241/FULLTEXT01.pdf |