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by Young, Hugh D.; Geller, Robert
by Geller, Walter; Schultze, Martin; Kleinmann, Robert; et al.
by Geller, Anne Ellen; Eodice, Michele; Boice, Robert
by Freedman, Roger; Geller, Robert; Kaufmann, William J.
by Geller, Robert
by Freedman, Roger; Geller, Robert; Kaufman, Roger
by Freedman, Roger; Scientific American; Kaufmann, William J.; et al.