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We show that there is a unique extremal even unimodular lattice of dimension48 which has an automorphism of order 5 of type 5-(8,16)-8. Since the threeknown extremal lattices do not admit such an automorphism, this provides a newexample of an extremal even unimodular lattice in dimension 48.

A fourth extremal even unimodular lattice of dimension 48