[1] J. W. ADDISON:
Some consequences of the axiom of contructibility. Fund. Math. vol. 46 (1959).
MR 0124206
[2] K. GÖDEL: The consistency of the axiom of choice and the generalized continuum - hypothesis with the axioms of set theory. Annals of Math. Studies No. 3, Princeton 1940.
[3] K. KURATOWSKI: Topologie I. the fourth printing. Warszawa 1958.
[4] N. LUSIN: Sur les ensembles analytiques et leur applications. Paris 1930.
[5] P. VOPĚNKA: Независимость континуум-гипотезы. CMUC 5 (1964), Supplementum I.