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by Webber, Mark; Sperling, James; Smith, Martin A.
by Economides, Spyros; Sperling, James
by Lucarelli, Sonia; Sperling, James; Webber, Mark
by Sperling, James
by Wagnsson, Charlotte; Sperling, James; Hallenberg, Jan
by Kirchner, Emil Joseph; Sperling, James
by Sperling, Daniel; Cannon, James S.