First of all, publishing a thesis is not synonymous with releasing the thesis in open access. Open access refers to the idea to make your thesis publicly available on the web. Publish a thesis refers to use the content of your thesis for building a scientific publication and submit it to a peer-review journal or conference.

via Francesco Lelli at the following url:

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This is a small description of the picture: First of all, publishing a thesis is not synonymous with releasing the thesis in open access. Open access refers to the idea to make your thesis publicly available on the web. Publish a thesis refers to use the content of your thesis for building a scientific publication and submit it to a peer-review journal or conference.