1. Artin E. [1942]: Galois Theory. University of Notre Dame Press. (Cf. the previous Foundations of Galois Theory, New York University, 1938.)
2. Sur la représentation des fonctions discontinues
3. On the Structure of Abstract Algebras
4. Cantor G. [1892]: ‘Über eine elementare Frage der Mannigfaltigkeitslehre’, Jahresbericht der DMV. English trans. in [Ewald, 1996, Vol. 2], pp. 920–923.
5. Corry L . [2003]: Modern Algebra and the Rise of Mathematical Structures. 2nd ed. Basel: Birkhäuser.