Reference for Dickerson's NEWHEL?

[lj1 at mrc-lmb.cam.ac.uk]

   Hello everybody! I have recently been using an implementation of
   the program NEWHEL91, written by Dickerson. I would like to cite
   the relative paper, but couldn't find any reference... is there
   anyone who could point me to one please?

   Thank you very much in advance, Luca.

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   Luca Jovine

   Structural Studies Division
   MRC Laboratory of Molecular Biology
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   Cambridge CB2 2QH
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