Please cite the following reference if Elves are useful in solving your structure.

Holton, J. M. & Alber, T. (2004) Proc. Natl. Acad. Sci. USA 101, 1537–1542.

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If you use Elves, then you use the programs Elves run, and you should cite all of them individually.

Typically, you will need to reference:

mosflm
Leslie, A.G.W., Brick, P. & Wonacott, A. (1986) Daresbury Laboratory Information Quarterly for Protein Crystallography 18, 33-39.

The "new" DPS indexing algorithm in mosflm
Ingo Steller Robert Bolotovsky and Michael Rossmann (1998) J. Appl. Cryst. 30, 1036-1040.

The CCP4 Suite:
Collaborative Computational Project, Number 4. 1994. "The CCP4 Suite: Programs for Protein Crystallography". Acta Cryst. D50, 760-763.

You should also, separately, reference individual CCP4 programs that Elves run:

crossec, dm, fft, freerflag, overlapmap, postref, rantan, revise, scala, scaleit, truncate, vecref

details on citing these are listed on the CCP4 website.

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If Elves run solve, then you should reference it:
Terwilliger, T.C. and J. Berendzen. (1999) "Automated structure solution for MIR and MAD". Acta Crystallographica D55, 849-861.
 

If Elves run shelx, you should reference it:

ref?

 

 

If you use denzo to index your first image, you should reference denzo:

ref?

Note, if Elves downloaded ccp4 or mosflm for you, then you should be sure to fill out the CCP4 licence form, and send it in to CCP4!