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The three-loop Adler $D$-function for ${\cal N}=1$ SQCD in the$\overline{\mbox{DR}}$ scheme is calculated. It appears that the result doesnot satisfy NSVZ-like equation which relates the $D$-function to the anomalousdimension of the matter superfields. However this NSVZ-like equation can berestored by a special tuning of the renormalization scheme. Also we demonstratethat the $D$-function defined in terms of the bare coupling does not satisfythe NSVZ-like equation in the case of using the regularization by dimensionalreduction. The scheme-dependence of the $D$-function written in the form of the$\beta$-expansion is briefly discussed.

The three-loop Adler $D$-function for ${\cal N}=1$ SQCD with various renormalization prescriptions