SCAD based in Bangkok have published this very interesting summary of strategies that work and don't work. Stray Animal Management Strategies.
Here also are the links to the two reports mentioned:
Guidelines for Dog Population Management W.H.O. Geneva, 1990 (page 74): ‘Removal and killing of dogs should never be considered as the most effective way of dealing with a problem of surplus dogs in the community: it has no effect whatsoever on the root cause of the problem’