András Hajnal and László Kalmár. An elementary combinatorial theorem with an application to axiomatic set theory. Publicationes mathematlcae (Debrecen), vol. 4 (1956), pp. 431–449. - E. Burger. Eine Bemerkung zur Bernays-Godel-Mengenlehre. Zeitschrift für mathematische Logik und Grundlagen der Mathematik, vol. 4 (1958), pp. 178–179.
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2019 ◽
pp. 147-178
1971 ◽
pp. 142-185