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found: LCCN 65-27548: Braun, H. Jordan-Algebren, 1966, c1965 (hdg.: Koecher, Max; usage: Max Koecher)
found: The Minnesota notes on Jordan algebras and their applications, c1999: t.p. (Max Koecher) p. (b. 1924 in Weimar; d. 1990 in Lengerich)