Giovanni Enrico Eugenio Vacca (18 November 1872 - 6 January 1953) was an Italian mathematician. He was born in Genoa, Italy and died in Rome, Italy.
Ivor Grattan-Guinness, 2000. The Search for Mathematical Roots 1870-1940. Princeton Uni. Press.
* O'Connor, John J.; Robertson, Edmund F., "Giovanni Vacca", MacTutor History of Mathematics archive, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Vacca.html .
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