I actually found that the book "Fight! A Practical Guide to the Treatment of Dog-Dog Aggression" by Jean Donaldson gives lots of very good advice on the problem.
But as Mirka says - having the advice is only half the solution, implementing it is the other half. We basically have two problems with it - first is consistency. It is really really difficult to be consistent. When you have all the time in the world it's not so bad, but in real life you are often working under time constraints, and that means you don't always have the time at the moment of an incident (aggression display) to correct it as you might like.
The other problem lies in the fact that the best way to correct dog-dog aggression requires interaction with other dogs, not as socialization, but rather to teach your own dog not to be aggressive. Unfortunately such exercises (described in great detail in the book above) are nearly impossible to perform as we simply don't know enough people with dogs and time to be able to carry out this training.
Bah... life is complicated, and wolfdogs never make things easy - but that's why we love them. (maybe)
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