Büchi, J. R., & Siefkes, D. (1973). The monadic second order theory of all countable ordinals. Springer.
Chicago Style (17th ed.) CitationBüchi, Julius Richard, and Dirk Siefkes. The Monadic Second Order Theory of All Countable Ordinals. Berlin: Springer, 1973.
MLA (9th ed.) CitationBüchi, Julius Richard, and Dirk Siefkes. The Monadic Second Order Theory of All Countable Ordinals. Springer, 1973.