Buchi, J. R., & Siefkes, D. (1973). Monadic second order theory of all countable ordinals.
Chicago Edition CitationBuchi, J Richard, and Dirk Siefkes. Monadic Second Order Theory of All Countable Ordinals. Springer-Verlag, Berlin, 1973.
MLA Edition CitationBuchi, J Richard, and Dirk Siefkes. Monadic Second Order Theory of All Countable Ordinals. 1973.
Warning: These citations may not always be 100% accurate.