  The number h of papers with at least h citations has been proposed to
evaluate individual's scientific research production. This index is robust in
several ways but yet strongly dependent on the research field. We propose a
complementary index hI = h^2/N_t, with N_t being the total number of authors in
the considered h papers. A researcher with index hI has hI papers with at least
hI citation if he/she had published alone. We have obtained the rank plots of h
and hI for four Brazilian scientific communities. Contrasting to the h-index
curve, the hI index present a perfect data collapse into a unique allowing
comparison among different research areas.
