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Algebra with positive numbers. Vol. 1. Algebra mit positiven Zahlen. Bd. 1(L’algebre par les nombres positifs. Tome 1). (French)
La Tour-de-Peilz, Switzerland: Delta. 1972. 152 p. Also supplement with solutions. (45 p.) Mit Loesungsheft (45 S.). Ser. Title: Collection GRETI-ICO.
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