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https://www.impan.pl/pl/wydawnictwa/czasopisma-i-serie-wydawnicze/acta-arithmetica/all/151/4/82693/on-the-4-rank-of-ideal-class-groups-of-quadratic-function-fields
On the 4-rank of ideal class groups of quadratic function fieldsAll
on theclass groupsquadratic functionrank