@article{10_4064_aa136_4_5,
     author = {Humio Ichimura and Hiroki Sumida-Takahashi},
     title = {On {Hilbert{\textendash}Speiser} type imaginary quadratic fields},
     journal = {Acta Arithmetica},
     pages = {385--389},
     publisher = {mathdoc},
     volume = {136},
     number = {4},
     year = {2009},
     doi = {10.4064/aa136-4-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa136-4-5/}
}