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Experimental AFMR studies of GdCr3(BO3)4 single crystal in a frequency range 17-38 GHz at 4.2 K have been carried out. The energy gap in the spin wave spectrum has been determined as 25.50.5 GHz. It is shown that the high-frequency properties of praseodymium ferroborate are well described in the frame of the model for a two-sublattice antiferromagnet with an easy-plane anisotropy