@article{10_4064_cm_65_2_255_265,
     author = {Franz Halter-Koch},
     title = {Factorization problems in class number two},
     journal = {Colloquium Mathematicum},
     pages = {255--265},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1993},
     doi = {10.4064/cm-65-2-255-265},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-65-2-255-265/}
}