Burgess, John P. A reflection phenomenon in descriptive set theory. (English) Zbl 0449.03048 Fundam. Math. 104, 127-139 (1979). MSC: 03E15 03C80 PDFBibTeX XMLCite \textit{J. P. Burgess}, Fundam. Math. 104, 127--139 (1979; Zbl 0449.03048) Full Text: DOI EuDML
Boolos, George Reflection principles and iterated consistency assertions. (English) Zbl 0409.03010 J. Symb. Log. 44, 33-35 (1979). MSC: 03B45 03F25 PDFBibTeX XMLCite \textit{G. Boolos}, J. Symb. Log. 44, 33--35 (1979; Zbl 0409.03010) Full Text: DOI