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Partially supported by “Comisión Asesora de Investigatión Científica y Técnica”.
This paper forms part of the doctoral thesis of the author, written under the guidance of Professor E. Bujalance. I wish to express him my deep graditude. I would also like to give my thanks to the referee for his useful advices.
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Martinez, E. Convex fundamental regions for N. E. C. groups. Arch. Math 47, 457–464 (1986). https://doi.org/10.1007/BF01189988
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DOI: https://doi.org/10.1007/BF01189988