@article{10_4064_aa_72_4_323_333,
     author = {Hourong Qin},
     title = {The 4-rank of $K₂O_F$ for real quadratic fields {F}},
     journal = {Acta Arithmetica},
     pages = {323--333},
     publisher = {mathdoc},
     volume = {72},
     number = {4},
     year = {1995},
     doi = {10.4064/aa-72-4-323-333},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-72-4-323-333/}
}