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by Meseguer, Alvaro
by Van Dyke, James
by Baumslag, Benjamin
by Setek, William M.
by Owen, George E.
by S. David Promislow (York University, Toronto, Canada)
by Van Dyke, James; Rogers, James; Adams, Holli
by Van Dyke/Rogers/Adams
by Schrö der, Bernd S. W.