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by Neittaanmaki, Pekka; Sprekels, Jurgen; Tiba, Dan
by Barbu, Viorel; Lasiecka, Irena; Tiba, Dan; et al.
by Barbu, V.; Bonnans, J. F.; Tiba, Dan
by Viorel Barbu; Irena Lasiecka; Dan Tiba