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by Kari, Jarkko; Manea, Florin; Petre, Ion
by Ehrenfeucht, Andrzej; Harju, Tero; Petre, Ion; et al.
by Priami, Corrado; Back, Ralph-Johan; Petre, Ion
by Priami, Corrado; Back, Ralph-Johan; Petre, Ion; et al.
by Calude, Cristian S.; Kari, Jarkko; Petre, Ion; et al.
by Petre, Ion; De Vink, Erik; Priami, Corrado
by Andrzej Ehrenfeucht; Tero Harju; Ion Petre; et al.
by RalphJohan Back; ?Ion Petre; ?Erik de Vink
by Cristian S. Calude; ?Jarkko Kari; ?Ion Petre