  An analysis of the data collected in 1997 and 1998 with the DELPHI detector
at e+e- collision energies close to 183 and 189 GeV was performed in order to
extract the hadronic and leptonic fermion-pair cross-sections, as well as the
leptonic forward-backward asymmetries and angular distributions. The data are
used to put limit on contact interactions between fermions, the exchange of
R-parity violating SUSY sneutrinos, Z' bosons and the existence of gravity in
extra dimensions.
