That Perseus' link doesn't work, but I believe that the place of accent is just before enclitics even without Perseus.
But in the grammars I'd read before nothing had been written about it (you understand, all of them are Russian grammars, and I don't know, why here in Russia all the authors ignorate this feature, although the others may be described very well). Even in the very full historical investigation by Tronsky this question is ignorated too, not speaking about the explanations of its reasons. And I ask if anybody knows them - the (historical?) reasons to place the accent so that this breaks the common way to do it.