@article{JRAM_1979__0307_0308_152127,
     author = {Shinju Kobayashi},
     title = {Divisibility of class numbers of real cyclic extensions of degree 4 over {Q.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {365--372},
     publisher = {mathdoc},
     volume = {0307_0308},
     year = {1979},
     zbl = {0395.12013},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1979__0307_0308_152127/}
}