http://www.cryst.bbk.ac.uk/PPS2/assignments/week14.html
The latest section of course material, by Kurt Berndt, is at
http://broccoli.mfn.ki.se/course/ss_final_1.html
but is now mirrored within the PPS hypertree, so can be found at
http://www.pdb.bnl.gov/PPS2/course/section8/ss_final_1.html
http://www.dl.ac.uk/PPS/course/section8/ss_final_1.html
http://www.man.poznan.pl/PPS/course/section8/ss_final_1.html
Best wishes,
The Course Organizers