My question about research papers was closed (which I have no problem with), but I got no hint on where it would be appropriate.
Where should the question be posted?
You need to check the FAQ section of potential sites, always. If you look at the Academia FAQ for example, you'll see that your question would be off-topic there too (it's about being an academic, not about questions that academics could potentially answer).
The Computer Science beta site looks promising though:
Since you are approaching a CS research problem, it would seem that your question could very well be on topic there.
The FAQ for that site is still under development it seems, as that community is coming to grips with what is and is not on-topic. Do look around at existing questions there, and when in doubt, ask on their meta site if your question would be on-topic.
Also, please review the Good Subjective, Bad Subjective blog post to see if you can word your request in the most constructive form.
It is not appropriate on any of the SE sites. There are a number of problems with the post; some may be fixable, but some are too inherent to be fixed.