@article{MAN_1969__181_161817,
     author = {E. FRANK},
     title = {Continued {Fraction} {Expansions} for {Imaginary} {Quadratic} {Surds.}},
     journal = {Mathematische Annalen},
     pages = {74--80},
     publisher = {mathdoc},
     volume = {181},
     year = {1969},
     zbl = {0162.34801},
     url = {http://geodesic.mathdoc.fr/item/MAN_1969__181_161817/}
}