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by Baggett, Patricia; Ehrenfeucht, Andrzej
by Ehrenfeucht, Andrzej; Harju, T.; Rozenberg, Grzegorz
by Ehrenfeucht, Andrzej; Harju, Tero; Petre, Ion; et al.
by Andrzej Ehrenfeucht; Tero Harju; Ion Petre; et al.