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Karl Menger
http://www.iit.edu/~am/Menger/menger.html
Biography, bibliography, fields of research and references.
Karl Menger
http://www.ams.org/notices/199605/comm-menger.pdf
A memorial note by Seymour Kass. PDF file.
Menger
http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Menger.html
A short biography of Karl Menger (1902-1985)
Menger, Karl (1902-1985)
http://staff-www.uni-marburg.de/~multimed/theorie/economics/grenznutzen/bios/Menger.html
Short biography and works cited.