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Four precession methods for the study of triclinic crystals are discussed. Three are well-known, but an apparent ambiguity in the choice of one of the reciprocal angles has not been sufficiently emphasized in two of them and a criterion for an unequivocal decision is derived. A fourth method, requiring only one  completely random  mounting of the crystal, is introduced.

Triclinic crystals and the Buerger precession method