Graham Pawelec ¹, Ed Remarque ², Yvonne Barnett ³, Rafael Solana ⁴

1 University of Tübingen, Tübingen, FRG ², University of Leiden, Leiden, Holland ³, University of Ulster, Coleraine, Northern Ireland ⁴, University of Córdoba, Córdoba, Spain

Received 12/29/97 Accepted 1/5/97

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