Zhang, Zhenliang Falling shadow of antitonic set-valued mappings. (Chinese. English summary) Zbl 0825.28002 J. Kunming Inst. Technol. 14, No. 2, 61-65 (1989). MSC: 28A75 Length, area, volume, other geometric measure theory 26E35 Nonstandard analysis 28B20 Set-valued set functions and measures; integration of set-valued functions; measurable selections PDFBibTeX XMLCite \textit{Z. Zhang}, J. Kunming Inst. Technol. 14, No. 2, 61--65 (1989; Zbl 0825.28002)