@article{ELMA_1966__21_140825,
     author = {J. Steinig},
     title = {On {Euler's} {Idoneal} {Numbers.}},
     journal = {Elemente der Mathematik},
     pages = {73--88},
     publisher = {mathdoc},
     volume = {21},
     year = {1966},
     zbl = {0154.29206},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1966__21_140825/}
}