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Richard Courant
Courant, R.; Hilbert, D.
Courant, Richard, and Hilbert, David
Courant R,
Hilbert, D., Courant, Richard
Courant, R., and Hilbert, D.
Richard, and Hilbert, David Courant
David Courant Richard; Hilbert

See also:

Richard;Hilbert, D.;Hilbert, David Courant