  The concept of h-index has been proposed to easily assess a researcher's
performance with a single two-dimensional number. However, by using only this
single number, we lose significant information about the distribution of the
number of citations per article of an author's publication list. Two authors
with the same h-index may have totally different distributions of the number of
citations per article. One may have a very long "tail" in the citation curve,
i.e. he may have published a great number of articles, which did not receive
relatively many citations. Another researcher may have a short tail, i.e.
almost all his publications got a relatively large number of citations. In this
article, we study an author's citation curve and we define some areas appearing
in this curve. These areas are used to further evaluate authors' research
performance from quantitative and qualitative point of view. We call these
areas as "penalty" ones, since the greater they are, the more an author's
performance is penalized. Moreover, we use these areas to establish new metrics
aiming at categorizing researchers in two distinct categories: "influential"
ones vs. "mass producers".
