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fabrication, i.e. making up of results and their recording as real.
falsification, i.e. manipulation of research materials, equipment, processes or change, omission, suppression of data or results without justification.
plagiarism, i.e usage of other people's work or ideas without giving proper credit to the original source. This is a violation of the rights of the original author(s) to their intellectual outputs.
Other unacceptable practices are specified here (page 10/11).
Source: The European Code of Conduct for Research Integrity
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