Here is a really informative review by the editor of the Journal of Manipulative & Physiological Therapeutics, just published in the September issue.
See also Salami Publishing and accompanying comments
Johnson C. Repetitive, duplicate, and redundant publications: A review for authors and readers [editorial]. J Manipulative Physiol Ther 2006; 29(7):505-509. [Available by subscription only; e-mail me.]
Abstract: Repetitive, duplicate, and redundant publications are an important concern in the scientific literature. Their occurrence affects science and carries with it sanctions of consequence. This editorial provides a brief review of the definitions, classifications, impact, sanctions, and prevention strategies regarding repetitive, duplicate, and redundant publications.
Trying to define the problem
What is wrong with duplicate publication?
Why do people do it?
When is duplicate publication acceptable?
Who is responsible?
Actions and sanctions once covert duplication is identified
How to prevent duplication
The JMPT policy and conclusion PubMed Record DOI Link
Filed under: Writing & Publishing