1. Ackermann, W.,Zur Axiomatik der Mengenlehre, Math. Ann.131 (1937), pp. 336?345.
2. Alling, N.,On the Existence of Real-Closed Fields that are ??-sets, Trans. Am. Math. Soc.103 (1962), pp. 341?352.
3. Alling, N.,On Ordered Divisible Groups, Trans. Am. Math. Soc.94 (1960). pp. 498?514.
4. Alling, N.,Conway's Field of Surreal Numbers, Trans. Am. Math. Soc.287 (1985), pp. 365?386.
5. Alling, N. andEhrlich, P.,An Alternative Construction of Conway's Surreal Numbers, C. R. Math. Rep. Acad. Sci. CanadaVIII (1986), pp. 241?246.