  Elastic scattering of neutrinos and antineutrinos on nucleons is considered.
It is shown that the measurement of the neutrino-antineutrino asymmetry would
allow to obtain model independent informations on the strange axial and vector
form factors. The ratio of the magnetic form factors of the proton and neutron,
on which the asymmetry depends, is investigated in detail. The asymmetry is
calculated under different assumptions on the behavior of the strange vector
and axial form factors.
