Optical and near-IR Spectrophotometry of CNSFRs: Preliminary Results
  Preliminary results from spectrophotometric observations of Circumnuclear Star Forming Regions (CNSFRs) in the spiral galaxies NGC 2903, NGC 3351 and NGC 3504 are presented. The analysis is focused both on the determination of elemental abundances in the gas and the unveiling of the ionising stellar population responsible of the observed excitation in these regions. 
M. Castellanos (UAM), A.I. Diaz (UAM), M. Alvarez-Alvarez (UAM), E.   Terlevich (INAOE)