[ccp4bb] unknown PyMOL script author

[MARTYN SYMMONS]

Dear CCP4ers
Do you recognize your Python code in the script below? I got this from a script 
in the PyMOL wiki last year but now I can't locate it or identify the author. I 
have used this syntax extensively in some structural analysis that I am now 
writing up and I would like to credit the originator (PyMOL and the wiki both 
get a citation obviouslybut I checked and neither Warren Delano nor Jason 
Vertrees is the author). 
 
    for a in cmd.index("A//37/CB"):
        for b in cmd.index("B//LYS/NZ"):
                cmd.select("s1","%s`%d"%a)
                cmd.select("s2","%s`%d"%b)
                if cmd.select("(s1|s2) and not ?skip"):
                    if cmd.dist("tmp","s1","s2") < 20.0 :
                          print '',cmd.iterate("s1|s2","print 
'',segi,resn,resi,name"),round(cmd.dist("tmp","s1","s2"),3)

Thanks
        Best wishes
          Martyn 

Martyn Symmons
Department of Pathology
University of Cambridge