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by Harmsen, Jan; Verkerk, Maarten
by Verkerk; Maarten J.
by Grevin, Benoit; Turcan-Verkerk, Anne-Marie
by Falmagne, Thomas; Stutzmann, Dominique; Turcan-Verkerk, Anne-Marie; et al.
by Verkerk, Herman
by Verkerk, Willow
by Lindemann, Hilde; McLaughlin, Janice; Verkerk, Marian A.
by Verkerk, Herman; Montalti, Maurizio