SIMBAD references

We present an analysis of the secular variability of the longitudinal magnetic field B_ein the roAp star γ Equ (HD 201601). Measurements of the stellar magnetic field B_ewere mostly compiled from the literature, and we appended also our 33 new B_emeasurements which were obtained with the 1-m optical telescope of the Special Astrophysical Observatory (Russia). All the available data cover the time period of 58 yr, and include both phases of the maximum and minimum B_e. We determined that the period of the long-term magnetic B_evariations equals 91.1±3.6 yr, with B_e(max) =+577±31 G and B_e(min) =-1101±31 G.