@article{10_4064_aa104_2_3,
     author = {Toru Komatsu},
     title = {An infinite family of pairs of quadratic fields ${\Bbb Q}(\sqrt D)$ and
 ${\Bbb Q}(\sqrt { mD})$ whose class numbers are both divisible by 3},
     journal = {Acta Arithmetica},
     pages = {129--136},
     publisher = {mathdoc},
     volume = {104},
     number = {2},
     year = {2002},
     doi = {10.4064/aa104-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa104-2-3/}
}