Since SHELX is frequently cited incorrectly, after some arm-twisting by the Acta Cryst. editors I have written a paper:
"A short history of SHELX". Sheldrick, G.M. (2008). Acta Cryst. A64, 112-122 which may be safely cited whenever any program with a name beginning with "SHELX..." is used. I do not expect anyone to actually read it, but for those who wish to do so, it is available as "Open Access" at: http://journals.iucr.org/a/issues/2008/01/00/issconts.html George Prof. George M. Sheldrick FRS Dept. Structural Chemistry, University of Goettingen, Tammannstr. 4, D37077 Goettingen, Germany Tel. +49-551-39-3021 or -3068 Fax. +49-551-39-2582