PPAULO,

Check this out:

http://carmaux.cs.gsu.edu/~mweeks/summary.html

Research Paper Summary

In this assignment, you will read and summarize a current research paper. The paper will come from an established journal, such as ...

Ok, now as I see it

A Research Paper Summary has the purpose of explainig an aspect of a previously written paper.

Now as for an ABSTRACT:

An abstract is a brief summary of a research article, thesis, review, conference proceeding or any in-depth analysis of a particular subject or discipline, and is often used to help the reader quickly ascertain the paper's purpose. When used, an abstract always appears at the beginning of a manuscript, acting as the point-of-entry for any given scientific paper or patent application.

http://en.wikipedia.org/wiki/Abstract_(summary)