[1] Bouгbaki N.: Theory of Sets. Addison Wesley, Mass., 1968.
[2] Fгaenkel A.: Abstract Set Theory. Noгth-Holland Pub. Co. New York, 1976.
[3] Hessenberg G.: Grundbegriffe der Mengenlehre. Goettingen, 1906.
[5] Rubin J.:
Set Theory for the Mathematician. Holden-Day, San Franc. 1967.
MR 0215726