- https://sitegeist.de/blog/typo3-blog/responsive-images-with-typo3-8-7.html
- https://packagist.org/packages/sitegeist/sms-responsive-images
- https://www.youtube.com/watch?v=2QYpkrX2N48
- https://www.youtube.com/watch?v=Bf89tsiIPjo
- https://docs.typo3.org/m/typo3/reference-coreapi/11.5/en-us/ApiOverview/CropVariants/ContentElement/Index.html
- https://www.mtug.de/fileadmin/files/2017/2017-11-Responsive_Images_TYPO3_Crop_Varianten.pdf
- https://docs.typo3.org/m/typo3/reference-coreapi/10.4/en-us/ApiOverview/CropVariants/General/Index.html
- https://www.mediaevent.de/html/picture.html
- https://ivent.de/bilder-fotos-internet-speichern
- https://kulturbanause.de/blog/uebersicht-der-bild-grafikformate-im-web/
- https://www.html-seminar.de/gimp-bilder-nachschaerfen.htm
