The 4-rank of $K₂O_F$ for real quadratic fields F

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1. P. E. Conner, J. Hurrelbrink, On elementary abelian 2-Sylow K₂ of rings of integers of certain quadratic number fields
2. Marius Crainic, Paul Arne Østvær, On two-primary algebraic K-theory of quadratic number rings with focus on K₂