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Single crystals of Y_{1-x}Dy_{x}Ni_{2}B_{2}C (1 ≤ x ≤ 0.7) were examined by X-ray diffraction and stoichiometry was attested by XPS measurements. The superconducting transition temperature T_{c} and Neel temperature T_{N} were determined by means of magnetisation measurements. A dramatic breakdown of the de Gennes scaling in the Dy-rich compounds was found when T_{c}