SIMBAD references

We report the results of our studies of gravitational instabilities of accretion disks in the innermost few 100 parsec of galactic nuclei. We take our own Galactic Center as an example and find that it is far away from being gravitationally unstable. We then examine the stability of disks in other galaxies. Our models show that we need quite extreme parameter values in order to get instabilities. Even in in these cases, the disks become stable after a few 100 million years due to the accretion process.