Elemental abundances in the center of the Galactic Nuclear Disc
  We have made the first attempt to derive the chemical properties of the
Galactic disc at its very central part using high-resolution infrared
spectroscopic observations of four classical Cepheids. Those stars are located
at Galactocentric distances smaller than 1 kpc. All investigated stars show
near-to-solar elemental abundances. By combining these new data with our
previous studies, this result suggests that the radial distribution of iron
abundance on a logarithmic scale gradually increases from the outskirts of the
Galactic disc to Galactocentric distances of about 2-4 kpc, reaching there a
maximal value of about +0.4 dex, and then declines sharply to about the solar
value at the Galactic Center.
