SIMBAD references

The drift periods P₂ and P₃ were searched for using the summed power spectra of 41 pulsars observed at declinations from -9° to +42°. The power spectra of pulses with a given period, pulse width, and drift behaviour have been simulated, the applicability of such a method for estimating drift parameters is shown. For most pulsars, the distribution of harmonic amplitudes in the power spectra corresponds to the expected distribution for these pulsars without drift. At the same time, it was found that for a number of sources, the summed power spectra accumulated over a long period of time give the same drift parameters as those determined by other methods. For 11 pulsars we have defined or redefined the drift period P₂. For eight sources the drift period P₃ has been determined or redefined. The drift direction of subpulses was redefined for them.