Citation for (18548)

The following citation is from MPC 42366:

(18548) Christoffel = 1997 AN12
     Elwin Bruno Christoffel (1829-1900) was a professor at various
German universities.  His work on quadratic differential forms,
inspired by Riemann, anticipated some of the results of tensor
theory later developed by Ricci and Levi-Civita.

A complete set of naming citations of the numbered minor planets is available in the Dictionary of Minor Planet Names, edited by Lutz Schmadel.

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