Bronshtejn, I. U. Extension of transformation groups. (Russian) Zbl 0203.32906 Sib. Mat. Zh. 9, 13-20 (1968). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page PDFBibTeX XMLCite \textit{I. U. Bronshtejn}, Sib. Mat. Zh. 9, 13--20 (1968; Zbl 0203.32906)