  In this work, we develop a variant of a bundle method in order to find a zero
of a maximal monotone operator. This algorithm relies on two polyhedral
approximations of the epsilon-enlargement of the considered operator, via a
systematic use of the transportation formula. Moreover, the use of a double
polyhedral approximation in our algorithm could inspire other bundle methods
for the case where the given operator can be split as the sum of two other
maximal monotone operators.
