We report the results of the observations of the three \gamma -ray pulsars PSR B0656 + 14 , PSR B1055 - 52 and PSR B1706 - 44 performed with BeppoSAX .
We detected a pulsed emission only for PSR B1055 - 52 : in the range 0.1 – 6.5 keV the pulse profile is sinusoidal and the statistical significance is 4.5 \sigma .
The pulsed fraction was estimated 0.64 \pm 0.17 .
This pulsation was detected also at energies greater than 2.5 keV suggesting either a non-thermal origin or a quite high temperature region on the neutron star surface .
Spectral analysis showed that only the X-ray spectrum of PSR B1706 - 44 can be fitted by a single power–law component , while that of PSR B1055 - 52 requires also a blackbody component ( kT = 0.075 keV ) and that of PSR B0656 + 14 two blackbody components ( kT _ { 1 } = 0.059 , kT _ { 2 } = 0.12 keV ) .