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1. Juhаsz I. Cardinal Functions in Topology. \emph{Math. Сеntrе Тrасts}, 34. Amsterdam,   1971.   2. Наjnаl А., Juhаsz I. Оп hereditarily $\alpha$-sеpаrаblе and $\alpha$-Liпdel\”of $\alpha$-Lindel\"of  spaces. \emph{Annales Univ. Sci. Budapest} \textbf{11}, 19б8, 115—124. 3. Кunеn К. Ultrafilters and independent sets. \emph{Tгans. Аmеr. Math. Sос.} \textbf{172},   1972; 299-306. 
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