Bibliography:
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Ideas for the backtracking swapping algorithm:

[1] Michael Marte - Models And Algorithms For School Timetabling - 
A Constraint Programming Approach - 2 July 2002
(free, on the internet) - Section 2.2.5 - Manual Timetabling - pages 23-24.

[2] Jantien Hartog - Timetabling on Dutch High-Schools - 
Satisfiability versus gp-Untis - March 2007
(free, on the internet) - Section 5.2 - page 27.

You may find more information on the FET documentation web page, http://lalescu.ro/liviu/fet/doc/
