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The sense of the Dzyaloshinskii–Moriya (DM) vector D has been experimentally determined for the canted antiferromagnetic FeBO3 crystal using the interference between magnetic and resonant channels in synchrotron x-ray scattering. The phase of antiferromagnetic ordering was fixed by external magnetic field and the phase of resonant scattering was calculated with FDMNES program. The DM interaction EDM=D•[s1×s2] between neighboring magnetic moments s1 and s2, is also very important for multiferroics and helimagnetic MnSi-type crystals with the spiral or Skyrmionic structures.