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Dauns, Modules and Rings, Cambridge University Press, 1994. Divinsky, Rings and Radicals. Toronto Press, Toronto, 1965. Ringel, primitive resolutions of landslides and ideals. Springer-Verlag, Berlin-Heidelberg-New York, 1994. Roiter, terms of Deliberate Dimensional Algebras. Springer-Verlag, Berlin-Heidelberg-New York, 1997.