@article{10_4064_aa96_3_2,
     author = {Toru Komatsu},
     title = {A family of infinite pairs of quadratic fields ${\Bbb Q} (\sqrt{D})$ and 
${\Bbb Q} (\sqrt{-D})$ whose class numbers are both divisible by 3},
     journal = {Acta Arithmetica},
     pages = {213--221},
     publisher = {mathdoc},
     volume = {96},
     number = {3},
     year = {2000},
     doi = {10.4064/aa96-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa96-3-2/}
}