[2] G. Szász:
On the structure of semi-modular lattices of infinite length. Acta scientarium mathem. 14 (1952), 239-245.
MR 0052394
[3] G. Szász:
Generalization of a theorem of Birkhoff concerning maximal chains of a certain type of lattices. Acta scientarium math. 16 (1955), 89-91.
MR 0071398
[4] J. Jakubík:
On the Jordan - Dedekind chain condition. Acta scientarium math. 16 (1955), 266-269.
MR 0077502
[5] A. Tarski: Sur les classes closes par rapport à certaines opérations élémentaires. Fund. Math. 16 (1929), 181-305.
[6] F. Hausdorff: Grundzüge der Mengenlehre. Leipzig, 1914.