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A note on Friedlander's paper "On the class numbers of certain quadratic extensions" A. Mallik (1979) Acta Arithmetica
A practical version of the generalized Lagrange algorithm. Buchmann, Johannes, Jüntgen, Max, Pohst, Michael (1994) Experimental Mathematics
Algebraische Eigenschaften der lokalen Ringe in den Spitzen der Hilbertschen Modulgruppen. Reinhardt Kiehl, Eberhard Freitag (1974) Inventiones mathematicae
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