  We show a sufficient condition for Fujiki-Oka resolutions of Gorenstein
abelian quotient singularities to be crepant in all dimensions by using
Ashikaga's continuous fractions. Moreover, we prove that all three dimensional
Gorenstein abelian quotient singularities possess a crepant resolution as a
corollary. This alternative proof of existence needs only simple computations
comparing with the results ever known.
