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by Robert C. Hansen; Robert E. Collin (Case Western Reserve Univ.)
by Menasse, Robert; Hansen, Thomas S.; Hansen, Abby J. H.
by Hansen, Robert
by Hansen, Robert C.
by Hansen, Robert C.; Collin, Robert E.
by Treiblmaier, Horst; Hansen, Hans Robert
by Morantz, Regina Markell; Pomeroy, Robert W.; Fenichel, Carol Hansen
by HANSEN, MARK VICTORALLEN, ROBERT G.