1. American Mathematical Society Colloquium Publications, Vol. 25;Birkhoff, Garrett,1948
2. The topology of ordered Abelian groups;Cohen, L. W.;Trans. Amer. Math. Soc.,1949
3. An isomorphism theorem for real-closed fields;Erdös, P.;Ann. of Math. (2),1955
4. On intervals of ordered sets;Gillman, Leonard;Ann. of Math. (2),1952
5. Some remarks on 𝜂_{𝛼}-sets;Gillman, L.;Fund. Math.,1956