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Our numerical method to compute the regularized canonical vacuum energy
and the bag constant of the fermionic MIT bag was explained in Ref.[21].
The procedure is
based on a mode sum representation of the cavity propagator. A Schwinger
parametrization of the Euclidean ``momentum-squared'' denominator and a subsequent
integration over the ``off-shell'' parameter 
are performed.
Marc Schumann
2000-10-16