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==References==
* Hilbert Levitz, ''[http://www.cs.fsu.edu/~levitz/ords.ps Transfinite Ordinals and Their Notations: For The Uninitiated]'', expository article (8 pages, in [[PostScript]])
*{{citation|last= Pohlers|first=
*{{citation|mr=0505313|last= Schütte|first= Kurt |title=Proof theory|series= Grundlehren der Mathematischen Wissenschaften|volume= 225|publisher= Springer-Verlag|place= Berlin-New York|year= 1977|pages= xii+299 | isbn= 978-3-540-07911-8}}
*{{citation|mr=0882549|last= Takeuti|first= Gaisi |title=Proof theory|edition= Second |series= Studies in Logic and the Foundations of Mathematics|volume= 81|publisher= North-Holland Publishing Co.|place= Amsterdam|year=1987| isbn= 978-0-444-87943-1}}
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