@article{AMLG_1972__15_137878,
     author = {J\"org Flum},
     title = {Hanf numbers and well-ordering numbers.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {164--178},
     publisher = {mathdoc},
     volume = {15},
     year = {1972},
     zbl = {0267.02039},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1972__15_137878/}
}