Choban, M. M. Many-valued mappings and Borel sets. I. II. (Russian) Zbl 0231.54013 Tr. Mosk. Mat. Obshch. 22, 229-250 (1970); ibid. 23, 277-301 (1970). MSC: 54C60 54C05 54C10 54H05 PDFBibTeX XMLCite \textit{M. M. Choban}, Tr. Mosk. Mat. O.-va 22, 229--250 (1970; Zbl 0231.54013)
Frolík, Zdeněk A measurable map with analytic domain and metrizable range is quotient. (English) Zbl 0198.55702 Bull. Am. Math. Soc. 76, 1112-1117 (1970). MSC: 54E52 54C10 54C50 54H05 PDFBibTeX XMLCite \textit{Z. Frolík}, Bull. Am. Math. Soc. 76, 1112--1117 (1970; Zbl 0198.55702) Full Text: DOI