Retraction is a mechanism for correcting the literature and alerting readers to publications that contain such seriously flawed or erroneous data that their findings and conclusions cannot be relied upon. Unreliable data may result from honest error or from research misconduct.
Retractions are also used to alert readers to cases of redundant publication (i.e. when authors present the same data in several publications), plagiarism, and failure to disclose a major competing interest likely to influence interpretations or recommendations.
Note: Only published items can be retracted. Publications should be retracted as soon as possible after the journal editor is convinced that the publication is seriously flawed and misleading (or is redundant or plagiarized).
"Plagiarism", "Bogus claims of authorship", "Multiple submission", "Fraudulent use of data", "Infringements of professional ethical codes", "Redundant publication", and "Failure to disclose a major competing interest" are convincing Reasons for retraction of publication.
The process of Retraction
For more information see the: http://publicationethics.org/files/retraction%20guidelines.pdf