We consider quasi-two-dimensional atomic/molecular Bose-Einstein condensates
with both contact and dipole-dipole interactions. It is shown that, as a
consequence of the dimensional reduction, and within mean-field theory, the
condensates do not develop unstable excitation spectra, even when the
dipole-dipole interaction completely dominates the contact interaction.Comment: 4 pages of RevTex4, 3 figures; Rapid Communication in Physical Review
A (to be published