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[1] https://ifross.org/?q=open-content-license-opl
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[3] https://ifross.org/?q=category/lizenzordnung/c-open-content-lizenzen
[4] https://ifross.org/?q=category/tags/opl
[5] https://ifross.org/?q=category/tags/open-content-license
[6] https://ifross.org/?q=artikel/open-content-us-verlag-prentice-hall-veroeffentlicht-buecher-unter-open-publication-license
[7] https://ifross.org/?q=user/login&destination=comment/reply/345%23comment-form
[8] mailto:axel.metzger@ifross.de
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[11] https://ifross.org/?q=category/tags/literatur